I have a Fisher Papa Bear VI 1980 in a workshop of a house I bought five years ago. New to this forum as I decided to get the chimney cleaned and inspected, and the guy that came by today said my stove was dangerous and shouldn't be used. He put a flashlight inside the stove and you could see light streaming out of the back. Specifically, it looks like the seam between the top and bottom steel plate in the back has opened up. Not sure if this seam was originally welded or filled with stove cement. I have attached a photo of the inside of the stove - you can see where the gap is. I love this stove and want to save it. Is this something I can/should weld up with my MIG welder? Is stove cement a better fix? After I fix this (if it is something that I can/should do) are there other spots/issues I should focus on? One other thing I noticed was that the cap on the back flue seems to be pretty thin. Where can I get a replacement for it? Also, some of the bricks are beat up - I presume that is a simple replacement. Are there any tips/tricks I should be aware of? Thanks!