One of the things I'd ask if this was a regular service interval is what that means. Is it a required inspection or actual rebuild?
An inspection is usually different than a rebuild. During an inspection, the IP and cracking pressures are checked. The filter is inspected for signs of bad air. Discoloration is a dead giveaway that something may be fishy inside.
Next is a negative pressure test to check for leaks in the diaphragms or cases.
The next thing I'll do check all the hose connections.
If the IP and cracking are where they are supposed to be with no evidence of creep, the IP locks up nice and tight, and the seconds are within factory specs with no free flow, the reg does not need to be rebuilt.
If the IP is where it's supposed to be with no creep, but there's a slight hiss from one of the seconds that is likely to need a rebuild. Unless, if it's an adjustable one and the slight hiss is when it's wide open, I'm going to ask the owner if that's the way they want it before I rebuild it.
Some divers like to tune their regs like that.
To take a reg that only has a few dives on (less than 50 in a year) and rebuild it just because the factory says to makes no sense.
The SPG not being properly tightened after a service should never, ever happen.
That said it is also the diver's responsibility to check their gear. Hose connections, second stages clear, etc.
As for the silicone on the second stage? As others have said - NO NO NO!
Depending on the second stage you have there may be a thin plastic or teflon shim between the case and the cover to prevent the cover from twisting the diaphragm if the part that turns actually comes into contact with it.
If that's the case and the shim is missing, they may have lost it or forgot to put it in. More indication of poor attention to detail.
Not exactly a place that inspires trust.
An inspection is usually different than a rebuild. During an inspection, the IP and cracking pressures are checked. The filter is inspected for signs of bad air. Discoloration is a dead giveaway that something may be fishy inside.
Next is a negative pressure test to check for leaks in the diaphragms or cases.
The next thing I'll do check all the hose connections.
If the IP and cracking are where they are supposed to be with no evidence of creep, the IP locks up nice and tight, and the seconds are within factory specs with no free flow, the reg does not need to be rebuilt.
If the IP is where it's supposed to be with no creep, but there's a slight hiss from one of the seconds that is likely to need a rebuild. Unless, if it's an adjustable one and the slight hiss is when it's wide open, I'm going to ask the owner if that's the way they want it before I rebuild it.
Some divers like to tune their regs like that.
To take a reg that only has a few dives on (less than 50 in a year) and rebuild it just because the factory says to makes no sense.
The SPG not being properly tightened after a service should never, ever happen.
That said it is also the diver's responsibility to check their gear. Hose connections, second stages clear, etc.
As for the silicone on the second stage? As others have said - NO NO NO!
Depending on the second stage you have there may be a thin plastic or teflon shim between the case and the cover to prevent the cover from twisting the diaphragm if the part that turns actually comes into contact with it.
If that's the case and the shim is missing, they may have lost it or forgot to put it in. More indication of poor attention to detail.
Not exactly a place that inspires trust.