As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NR 4004, ON FIRST ATTEMPT TO START THE APU THE DOOR DID NOT OPEN, ON SECOND ATTEMPT THE DOOR OPENED BUT THE RPM HUNG 28% & A STRONG FUEL ODOR FILLED THE CABIN. COMPLIED WITH CM ACTION PLACARDED & PLACED ON MEL. R & R APU ECU IAW AMM 49-61-01. OPERATIONS CHECKED GOOD. REMOVED PLACARD & REMOVED FROM MEL.