Looking at your pictures I think your receipt is correct. Top or Bottom Crank Bearing may have had a lack of oil causing it to seize, would explain why the previous owner thought it was Toast. If you shoot me the model I may have a complete digital manual for it in my stash. I can email or mail a flash drive if needed. I have a mountain of digital Yamaha manuals. You're going about it right to crack the case and check it completely before making it run.