As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT DUE TO PNEUMATICS SURGING(<P>FWD TO MEL AND PLAC 49-11-01A, CAT C, DUE 21AUG21. MDDR 151717.</P> / <P>REF LOGPAGE 1439202 ITEM 5: T/S PER FIM 49-11 F/T 976 TO BLOCK 28. NO SURGING OR FLUCUATION NOTED . 3 SUCCESSFUL APU STARTS ACCOMPLISHED AND LOAD PLACED ON APU . NO FAULTS NOTED , APU OPS NML AT THIS TIME. THIS CLEARS MDDR 151717, PLAC REMOVED.</P>)