As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING DECENT FROM FL260 TO 14000 CABIN ALT VERT SPEED FLUX FROM +100FT TO -1000 ON SYSTEM 1. NOTICEABLE PRESS CHANGES IN CABIN AND FLIGHT DECK. FOUND DEBRIS STICKING OUT FROM OUTFLOW VALVE (PIECES OF INSULATOR), REMOVED DEBRIS. OUTFLOW VALVE SEAL OK. NO DEFECT NOTED. ACCOMPLISHED OPS CHECK OF OUTFLOW VALVE IAW AMM 21-31-00. OPS CHECK NORMAL. ACCOMPLISHED OPS TEST OF PRESSURE CONTROL AND MONITORING I/A/W AMM 21-31-00-710-002-A. SYST CKS GOOD.