You should still see a tiny bit of movement even if the other port is closed. My ports are on the side. I think it depends on the model. You can download the manual for your particular model on their website.
It is really a little "bouncy" especially when trying to suck/blow by mouth. What you could do is to hook it up with an actual water manometer (quite easy to build one) and see how it reads.
The sensor looks like a thru-hole component so soldering won't be a problem. The hard part would be opening and re-sealing the unit. This is unlike the Shearwaters which uses O-rings and screws.
Replacing the depth sensor is almost impossible to do on your part. Your best recourse is to contact the guy/gal who sold it to to you. He/she might take it back even if there is no express or implied warranty.
It is a standard 2450 battery available in most electronics stores. Just get a decent brand. The O-ring is also a standard 70 shore 026 O-ring, but you don't have to change it unless it is damaged. Here is a video on how to do it:
"AC" only means that the water contacts are activated. It usually automatically starts the dive at at 3-4 m. How deep were you diving? With all that said, Suunto had a spate of problems with their depth sensors.
I use Heinz distilled white vinegar in 1:1 dilution with water. Time depends on the degree of verdigris or corrosion. I usually check every 5 minutes. For most cases 5 minutes is enough. I also sometimes use a soft bristled toothbrush for "stubborn" spots. Worked great so far.
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