When I did read the title of this topic, something in your words did hurt me.
"send regs away" to be serviced.
I would never separate myself from my regs. Nor allow an unknown guy, possibly with sub-par technical qualifications, to mess inside them.
I service them myself since 1977. And many others here on SB find that this is the only safe way...
I could consider bringing them to a local shop where I know the technician and I thrust him entirely. But also in that case I would ask to be present during servicing...
So my recommendation is to never leave your regs in someone other's hands.
If you are too lazy for servicing them, you have just two options;
1) find a technician you thrust and ask him to service the regs in front of you.
2) every two years buy a new set, trading in the old ones.
Option 2) could seem crazy, but in the end is not so much more expensive, and it is definitely the safest one.
Exactly as with cars: people using them for work do not buy cars, they long-rent them, and swap for a new car when they exceed the number of kilometers requiring major service (typically 100.000 km here in Europe, which can be less than 2 years for people travelling for work).