As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU ECU FAULTS NR 2 TC RAKE, EVEN AFTER ECU MEMORY CLEAR AND RE-RUNNING APU. IT FAULTS THAT UNIT ON ALL 5 SW SELECTIONS. REPLACED NR 2 TC RAKE PROBE, STILL HITS. SUSPECT ECU. ON ORDER 563-9004. REPLACED APU CONTROLLER PER MM. NO FAULTS ON 3 RUNS.