The repair shop in Osaka told me to skip the service manual and just listen to the shutter
I was in Osaka last spring poking around the little camera shops near Nipponbashi, and an old guy running one of them watched me fiddling with a jammed SLR for 10 minutes before he waved me over. He said service manuals tell you what a camera should do, but your ear tells you what it's actually doing, and then he had me dry fire a few bodies with my eyes closed until I could hear the difference between a slow curtain and a dragging one. I get why people here swear by torque specs and factory flowcharts, and I still use them on complex jobs, but that afternoon got me further on that jammed shutter than any diagram ever did. Do you lean on feel and sound during diagnosis, or is it strictly by the book for you?