I recently bought a perfectly working Mamiya 528AL. Pictures from the first test came out great. As for the second roll of film, after a while I noticed the film advance lever wasn't working as smoothly as usual and the exposure counter wouldn't advance (stuck at exposure #18).
I didn't know whether the film was advancing or not, so I decided to rewind it to save the pictures I had already taken. But the rewind release button was stuck (and still is): I couldn't push it down.
So I opened the back of the camera in a dark room and took the film out and half of it was tangled in the take-up spool. After that, the advance lever was working perfectly again.
I decided to open the bottom of the camera and check if there was something stuck next to the rewind button but I didn't find anything (although I noticed a sticky liquid a bit everywhere...is that normal? Could it be old grease for the gears?).
My question may be silly, but do I need to repair the rewind button - and do you know more or less how much it would cost, just to get an idea - or can I rewind the film without pressing it?