Howdy Mark and Welcome,
Sorry to hear you are having problems with the OBC. It sounds like you have had a failure on both the AC input side, and on the HVDC output side, which is not typical. It may be that more details of your failure would help determine what happened--usually these two don't happen at the same time.
Chances are that the fuse failed first and partially took out the blue snubber caps, then when you tried to go READY, it just finished them off.
What's the age and condition of the 12V AUX battery? If it's old or weak, then replace it before anything else. The brake light DTC could have been due to a low Aux, or the fuse was already blown and the DCDC converter wasn't able to charge the Aux.
i have blown snubbers that i've been trying to figure a good way to solder. Here is a picture of how i plan to solder my red m&m's. One side to the base of the spade lug for POA, the other side to the NO terminals of the waffle plate pins.
Be careful to not crack the epoxy coating on the leads when you make bends to the wire--hold the wire with needle nose pliers near the epoxy and make the bends on the wire side, not the device side.