Help with LED lunar light

I have two Currrent LED Lunar lights that stopped working. They started getting more and more dim and then finally produced no more light. The LEDs probably burned out right? I took them apart and they seem pretty simple. Think I can just solder in some new LEDs? I have a multimeter but wouldn't know where to start or what to test for. I don't need anything fancy, just would like to have some light again in the tank at night since it is pitch black otherwise and I like to look in.


 
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