Hi,
Is the glue around the base of that board meant to be there? It seems to cover a few components and may be shorting something out, but in principle it shouldn't be electrically conductive. I'd get a magnifying glass, or portable usb microscope if you have one, and check there are no solder bridges between those components at the bottom of the vertical board, just to be sure. It maybe depends on how hot the glue comes out but I think most solder melts at over 200ºC and these glues from 60ºC to 200ºC from what I just read so I'd be surprised if it could melt solder.
If you think there's a short/bridge, you could also try continuity testing between "safe" components, e.g. the LED pins or resistor to resistor etc. The ICs are not a good idea to continuity test between pins.
Tricky and unreliable but sometimes insightful is to measure capacitance onboard - if capacitor values - are known to gauge if one has been damaged from heat, SMD ceramic capacitors are easy to damage especially when going from cold to hot suddenly.