HELP: Zen V4 blowing fuse (and smoke as well)

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Thanks till.

Plan of action:

Replace Q1, Q2, Q5 (wait 3 days for UPS to deliver). Also, replace R0/R1 to be sure. Fuse at 1.5A, switch on with 150W lamp in series with the primary. The voltages should match up with the good channel (shown below). Any deviations will point to the problem.

Now, the good channel has IRFP240 for Q2, Q5 (part of passdiy Q-pack), so should I order IRFP240 for Q2, Q5 or can I just put IRFP044 for all of them (if it does not make any difference in the response)?
 

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