As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOST APU ELECT POWER DURING NR 1 ENG START. ABORTED START. RE-ESTABLISHED POWER. REPLACED NR 1 CONT BREAKER . ACCOMP INST TEST, AND TEST FAILED WITH SAME EFFECT. CLOSED C/B BEHIND P92. REPLACED (P5 4) AC SYS GEN AND APU MODULE WITH SERVICEABLE ONE. ACCOMP AC GEN AND APU CONT SYS TEST, TEST PASS REF M/M'S 20 60 01 860 801 24 21 41 400 801 24 21 51 400 801 AND 24 21 00 700 803.