As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM - AT PUSHBACK STATUS MSG, "APU FIRE LP 1" RETURNED TO GATE. PERFORMED FIM 26-15-00 FIG 103 TEST PASS. PERFORMED AMM 26-15-00 715-001 APU FIRE DETECTION SYS, OPS CHECKS GOOD. REPLACED APU FIRE DETECTION CARD PER AMM 26-10-01, OPS CHECKS GOOD.