As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FAULT EICAS MESSAGE. PERFORMED FIM TASK 49-11 FT 987 BITE PROCEDURE FAULTED " REVERSE FLOW" ALSO PERFORMED FIM TASK 49-11 FT 994, TS TO COMPRESSOR INLET TEMP SENSOR PN 3876072-1. REMOVED AND REPLACED APU SURGE CONTROL VALVE IAW AMM 49-53-01. OPS CHECK GOOD.