I was in my local goodwill today, and saw a beautiful Nikon F3 sitting in the glass case, priced at $150. I pulled out my phone and did a few quick searches, realizing that one that was this clean was worth a lot more (the only marks were rub marks from the strap lugs). I asked to see it and fiddled around, and I couldnt get the shutter to fire. Eventually I figured out there was a manual override and that made the shutter work perfectly, when it hit me that the batteries were probably dead. I opened up the compartment and there was a little corrosion, so I threw away the dead ones and took the 3volt out of my M6 that was around my shoulder, but still no luck with the main shutter button on any speed. I figured I'd take it home and see if I could get it to work by cleaning the compartment some more, as I have 7 days to return it for full credit. Still, once I took it home, I had no luck. This means to me that it's an electrical issue. Has anyone had this problem before? How much do you think it will cost me to fix it? I don't need any more 35mm cameras (I already have an M6 and an fm2 that's a little funky and some other things) but it's in beautiful shape and I'd really like to rescue it from the trash. I just can't afford a huge repair bill.