I have a 4' x10' solar collector (active hot water system) on my roof that has a hole in one of the header pipes. I would like to remove the glass top to try to repair this myself as local companies want to charge me over $1300 to rebuild it! Having never tackled this before I am concerned the glass will be difficult to remove off a panel thats been up on the roof for 20+ years. I dont want to break the glass! Any suggestions, ideas or advice on this?