As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU WON`T START REPOSITION FROM PAD TO GATE 6. T/S PER FIM AUTO SHUTDOWN GEN FILTER ON BITE. REMOVED AND REPLACED GEN DIFF PRESS SWITCH PER AMM. RAN APU, OPS NORMAL. T/S PER FIM AUTO SHUTDOWN GEN FILTER ON BITE. REMOVED AND REPLACED GEN DIFF PRESS SWITCH PER AMM. RAN APU, OPS NORMAL.