Hi-If you can get the panel for free you have nothing to loose. Take it apart and separate the broken cells.(Note the cells are brittle, be gentle) Remove any corrosion.This may take some time depending on how bad it is.I would stay away from steel wool. But if u do just use some of Dan's magnets to pick up the remnants Replace with cells of same size. there are some on E-Bay from time to time. Good soldering techniques are a must. practice on the broken cells Replace the front Glass with tempered Glass. You can test each cell with a volt and mill amp meter.if you have any other questions E mail me.