Had receiver wires rip out if case during a race. Can u solder them back to board without damage?

You void any warranty you may have by soldering on the board.

I've seen Castle reps warning not to attempt repairs that require soldering on the board on the RCM forums more than once. If there's any wire left still attached, it may be better to splice them rather than try to replace them on the board. Board is thick copper and its hard to get it hot enough to solder.