Jeff Rowland Model 1 blowing internal fuse

Hi guys

I have a Jeff Rowland model 1 power amp and it keeps blowing the one of the internal fuses whenever I start it up after it's sat overnight. It's the same upper LH fuse every time and after I power down the amp and replace it it's fine until the following day when the cycle repeats. Once the fuse is replaced I can run it all day, turn it off and on with no issues.

It started doing this after I bypassed the passive crossovers in my Martin Logan electrostatics and running them active. I can't find any schematics on this amp and the manufacturer doesn't have much interest in responding to my emails.

If anyone can help fix this annoying problem I'd appreciate it. I highlighted the fuse in question.
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Seems like there is too much initial surge current due to a very low DC load resistance.
What type and size of fuse does it use? Is this the original type of fuse that the amplifier came with?
What is the DC resistance of the speaker now?