Hi,
I've assembled the PCB and upgraded the firmware.
All was well with only a 1 amp fuse needed in the power feed to pin 25.
I then fitted it to the case and clamped down the FETs and IGBTs. It blew the fuse in the feed to pin 25 as soon as I powered it up:(
I removed it from the case and the PCB is still drawing 2.5 amps.
If anyone can suggest what to check.....