As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, NR 1 ENG HAD AN APPARENT COMPRESSOR STALL AND PIMU C1 FAULT MSG ON STATUS. LT PIMU EEC CH A/B B2.5 TR CHECK FAILED. REPLACED 2.5 BLEED ACT, PER MM 75-32-01. IDLE RUN OK, NO LEADS AND NO PIMU FAULTS. HP RUNUP OK, OPS OK PER PFHB TEST 15.