As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT LIGHT ILLUMINATED ON START, TWO ATTEMPTS. ACFT GROUNDED. PERFORMED FIL TASK 49-30, TASK 803. APU STARTED NORMALLY . NO FAULTS FOUND. DID FIND MESSAGE 49-31175. THIS MESSAGE IS RELATED TO 49-31016. AFTER NUMEROUS STARTS APU MAINT MESSAGE DID NOT SHOW 49-31016. NO OTHER MESSAGES NOTED AFTER START. ORIGINAL FAULT IS INTERMITTENT.