It may have been me. I did an overhaul of mine.
The panel is abs plastic, and abs plastic cement is actually a solvent that welds the plastic together. You can make a paste of abs plastic shavings and the cement and use it as a filler. To bridge the crack and give it some strength you need to weld a flat piece above it. Sheets of abs plastic should be available from a plastic supplier, possibly hobby shops, or you can pick up pieces of a broken end cap like I did at a salvage yard.
I'm off camping for the weekend. PM me with questions.