As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU "FAULT" ANNUNCIATOR ILLUMINATED ON APU START. LIGHT EXTINGUISHED AFTER 5 MIN. ATTEMPTED APU START AGAIN. "FAULT" LIGHT WAS ILLUMINATED AGAIN. GROUNDED YES. PERFORMED APU BITE PROCEDURE FOUND MX MSG NR 49 15004 INLET DOOR SHUTDOWN. PERFORMED FIM TASK 49 10 00 810 806 STEPS A. THRU E. NO CURRENT FAULTS DISPLAYED AT THIS TIME INTERMITTENT FAULT.