As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FAULT LIGHT ILLUMINATED WHILE STARTING APU. FOUND FAULT CODE 49 94299 ON CDU UNABLE TO DUPLICATE DISCREPANCY. REMOVED FILTER AND INSPECTED. APPEARS TO BE OK. INSTALLED NEW FILTER AND FILTER BYPASS SWITCH AS PRECAUTIONARY. RAN APU FOR 10 MINUTES LOADED NO FAULTS NOTED. LEAK CHECK GOOD. REF AMM 49 91 13 000 803 AND 49 91 13 400 803.