"Everlite" issues

Ive had my everlight for a couple of yrs, one had failed leds and was replaced under warranty. the one i bought for my inlaws failed (leds) as well. mine has been working fine as i say for a while but i noticed discolorations in the panel i finally got around to examining up close today . i was expecting some water and being able to ddry it out but this appears to be damage that may have been started by water leak but has become more. check out these pics and let me know if you have any idea what this is.. it almost looks like the dark PV material melted.. i couldnt really do much so i put it back together and left it out. the other 10w panel next to it that was my very first solar panel (and powers the kitchen nightlite with the c12 controller) looks brand new still, so lesson learned: no more cheap little all in ones.

the back of the PV for the everlite is actually open in a couple of spots so i suspect that was the issue, too bad as it works really well, throwing a pretty good light all night long for such a tiny charge source.