The master display board in my Firepower and Flash machines is similar. However in Flash there are 12K resistors installed instead of 10K as on Firepower (and in all the reference documentation I could find). Some of them are burned and obviously need to be replaced. But I wonder should I just replace them all with 10K 1/2W resistors? First pic is Firepower, the other two are Flash.

This is what I do, ala Clay's guide (I also change the Hi voltage to 91 volts): 10k ohms, 1/2 watt. Replace any that are more than 10% out of spec. The 10k is standard and the Master Display Boards are all the same.  I lift them a little off the board for some air circulation. Clean those solder pads well, and carefully I don't beleive they require a through hole contact though. System 4-6 Master Display Boards can be tricky characters - I've had many issues with these.