How are these leds mounted? Are they chip type, soldered via reflow method? If so, using a soldering iron to remove and replace probably is damaging them.
LEDs need to be heatsinked properly as well. How are they heatsinked?
The board is mounted to a heatsink with some thermal paste between. There are four fans blowing on the heatsink. The LEDs are the little round ones with two prongs coming for the negative and positive connections. The center part is actually stuck to the board with some kind of thermal glue. I’m not sure what reflow method is? I don’t think using a soldering iron to disconnect them is damaging them, but disconnecting the thermal glue with a screw driver is actually kind of difficult. The solder is easy.