As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU COLD SOAK START -62 DEGREES SAT FL390 ATTEMPTS 3 UNSUCCESSFUL. APU DOOR STATUS MESSAGE AFTER EACH ATTEMPT(<P>TRANSFERRED TO DMI# 140868 IAW MEL 49-15-01-01A CAT C DUE DATE 23JAN2021. M PROCEEDURES C/W - APU DOOR DEACTIVATED OPEN.</P><P>18JAN21 - LP 1253321 ITEM 5 - ONT: REMOVED AND REPLACED APU AIR INTAKE DOOR ACTUATOR IAW AMM 49-15-06. OPS CHECK GOOD. PERFORMED APU BITE IAW AMM 49-61-05. NO MESSAGES DISPLAYED.