As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH NR 2 ENG START FIRST, NR 1 ENG WILL ONLY MAX MOTOR TO 23 N2. ACFT GROUNDED. WITH NR 2 ENGINE RUNNING NR 1 ENGINE MOTORED TO 23. DUCT PRESSURE APPROX 15-20 PSI. TURNED OFF NR 2 ENGINE BLEED SWITCH AND PRESSURE RESUMED TO NORMAL AND MAX MOTOR WENT TO 30 N2. TURNING THE ISOLATION SWITCH TO CLOSED WILL ACCOMPLISH THE SAME. REPLACED PRSOV IAW MM 36-11-04 3. A-I. REPLACED BLEED AIR REGULATOR IAW MM 36-11-03-400 A-F.