As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OPS FLIGHT CHECK, WHILE ACCELERATING, (CHECK INSTRUMENT LIGHT) ILLUMINATED, THE PILOT IMMEDIATELY REDUCED POWER AND THE COMPRESSOR STALLED. PILOT RETURNED TO BASE AND NOTIFIED MAINTENANCE. THE MECHANIC REMOVED AND REPLACED THE BLEED VALVE AND THE AC WAS RETURNED TO SERVICE UPON COMPLETION OF FUNCTION CHECKS IAW MFG. (K)