Chain locked I lent out my Husqvarna 350 chainsaw, 1st mistake, and when it was returned the chain is locked, it can not even be manually rotated. I took the cover off and nothing jumps out at me and I don't want to screw anything up. There is no troubleshooting section in the owners manual. Any suggestions??

Well if you thought about it a chainsaw runs on a cintrifugal clutch so even if the engine was seized the chain and bar would probably still turn. I build log homes for a living and have a Husq 357xp and have dealt with things like this before. My guess is you weren't oiling good enough or at all, check that you are after fixing the seize. Kinda dumb question, have you checked your chain brake?

Can you turn the chainsaw over ( pull start cord s l o w l y .) if not your friend may have seized the engine. ( no oil in fuel, assuming it is two stroke.) then remove the chain and bar ( usually a couple of nuts/bolts) and try turning it over again. If it turns over or even starts, then the chain bar or clutch may need replacing. good luck.