Peter

>>> this time pulled the fuse out and when held up to the light it had a hair line gap <<<

I find quickest & best way of testing fuses is with a old style 4 watt bulb test pencil, with the circuit live touch on both side of fuse, if one side fails to light you have found the fault. saves pulling fuses & you can quickly run through all the fuses if need be.

cheers aidan