As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: #2 ENGINE BLEED VALVE FLUCTUATES 38-40 PSI CAUSING THE PACK FLOW TO FLUCTUATE. THIS THEN CAUSES THE CABIN PRESSURE TO FLUCTUATE +200/ - 500 PER MINUTE. REPLACED BLEED REGULATED PRESSURE TRANSDUCER 8HA2 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 36-11-16.