As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ENGINE START, W/ START VALVE OPEN BARELY REACHED 21 PSI. N2 AT 30 SEC, ONLY 18 AND ONLY REACHED 21 AT 45 SEC. SLIGHTLY SLOW TO ACCELERATE. R&R SURGE VALVE IAW AMM 49-53-01. NO FIX. REQUIRES MORE T/S. DMI REMAINS OPEN. SURGE VALVE OBSERVED NOT FULLY CLOSING. REMOVED AND REPLACED APU ASSY PER AMM 49-01-01/401 BUT IT WILL NOT START ECM SHOW ON LRU SUMMARY AP SENSOR P2 P1.