As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO FIELD DUE TO NR 1 ENGINE COMPRESSOR STALL. STALL-RTF. HPC WAS BOROSCOPED, OK. FOUND BAD 7TH STG BLEED VALVE, REPLACED. NR 1 ENGINE ACCOMPLISHED BORESCOPE OF HPC 3 AND 4, NO LIMITING DAMAGE FOUND. ACCOMPLISHED 7TH STAGE BLEED VALVE SOLENOID CHECK AND 10TH STAGE BLEED VALVE SOLENOID CHECK. REPLACED UPPER 7TH STAGE BLEED VALVE. ACCOMPLISHED POWER ASSURANCE RUN ON NR 1 ENGINE ALL INDICATIONS AND PARAMETERS NORMAL AND WITHIN LIMITS. NO STALLS OR SURGES.