As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON DESCENT AT FL 26,000 RECEIVED A NUMBER ONE ENGINE STALL COMPRESSOR FOR ABOUT 4 SECONDS FOLLOWED BY A LOUD THUMP. MAINTENANCE FOUND THE BLEED PRESSURE REGULATOR VALVE AND THE HIGH PRESSURE BLEED VALVE ON THE #1 ENGINE LEAKING. REPLACED THE BLEED PRESSURE REGULATOR VALVE PER AMM 36-11-52 (AALA202310031217) AND HIGH PRESSURE BLEED VALVE PER AMM 36-11-51. (AALA202310034151) A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.