Pull J-114 connector, power up and see if F115 fuse holds.

F115 is the 12VDC supply to the fliptronics board, DMD board, and MPU. Not sure why you believe it should be a FB fuse...manual shows SB in several places. Not just in Getaway either....I checked my CFTBL and BSD manuals and F115 is a SB fuse.

If with J-114 fuse holds, then likely not a board issue on driver board. You can then start eliminating the culprit.

Pull

J-606 on DMD board
J-210 on MPU
Power connector on Fliptronics (one with same color wires...grey)

With J-114 connected, power up. If fuse holds, start plugging in one at a time the other board connectors till you find the one that blows.

In the grand scheme, it's not going to hurt using the FB fuses to troubleshoot. You can even use a 1A SB fuse for testing purposes...that extra 250ma isn't going to cause a short term issue. Just put the correct fuse in when you're done.

Had a family emergency and have been away, but I see PM40 took the reins. You're in good hands as he's one of the best. Carry on.

Thats my vote...clean it off with some iso alcohol