Peltier died. Burn out? Condensation leakage? What could cause this?
Peltiers are difficult, and that cycling may have not been right. When you say 'about', without knowing the curves and how it's set up, that might have been too much- 48watts from your numbers, meaning a passive heatsink needed about 480 sq inches.

Also appears to have shorted between first row/column and second.

I always re-potted mine with blue RTV (electronic) after sealing it to a surface.