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Rod,
Your tech guy is giving you good advice. In 13 years of owning our boat, we have never turned it off except for the occasional defrost. It runs year round and cycles from 37 degrees to 42 degrees. These compressors are designed to run all the time just like at home. It can't hurt that your tech guy is coming down to test it either as long as he is qualified since your unit is 16 yrs old. He'll probably come down and stick a thermostat in the box and then settle back and wait for a readout all the time on your nickel and then tell you that you need better insulation which is probably true. He'll also most likely do a compression test and give you a shot of Freon if you need it but these units don't typically leak that stuff.
I did get rid of that silly thermostat that came with the unit and installed a digital one that A/B offers instead. I like it because you can never tell when the unit is running or what temp the box is at with the old one but you certainly can with the digital.
Anyway, go ahead and do it cause it can't hurt.

Phil,
I read your comment on your thermostat so am aware of your situation.
Well, what can I say?? Whether away from the dock or tied up to it, the A/B stays on and while at the dock the boat is plugged in. Naturally, if the boat was not plugged in and without doing a re-charge the house battery would expire in five days or so but I would estimate that this is a very common practice with the boaters staying plugged in and having the ability to have a cold beer when they want one around here. If a dock is wired correctly and up to code and your neighbors are good with their wiring and practices than there is little to no electrolysis problem. That may be the difference between what you do and what I do as your mechanic indicated.
Just got a return call from the Waeco - Adler Barbour tech guy who recommends keeping the unit on all the time and compares it to your fridge at home. He said "if you take everything out of the box and leave the boat for months on end, that would be the time to turn the unit off otherwise simply leave it on".
So again, if you have an electrolysis problem on your dock which prevents you from leaving your boat plugged in all the time than shut it down and continue doing what you are doing.