John completely overhauled my SRT 101 three years ago, and updated the battery from mercury to the current cells. He did a fine job and was very reasonable. I'm guessing the film advance problem is minor and can be remedied during overhaul. John described his work as "complete disassembly", and please note this is an entirely different ballgame, and far superior from someone saying they are doing a "CLA" (whatever that is). A CLA could be almost anything. I suggest you ask the tech what the plan is. Sorry if I have beat that point to death, as you may know this already.
I highly recommend John Titterington. My experience is that he is excellent to do business with.