As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT PRESSURE FLUCTUATING RAPIDLY BETWEEN 200-700 FPM. GROUNDED - YES. PFR SHOWS NO FAULT CORRESPONDING TO CABIN PRESS SYS. PERFORMED BITE TEST OF CPC1 AND CPC2 PER AMM 21-31-00 FOUND ONLY CPC2 CLASS 3 FAULT "LGCIU SIG REPLACED". FOLLOW TSM 21-31-00-810-817A FOUND NO FAULTS. CPC1 AND CPC2 OPS CHK OK. ALSO CHECKED OUTFLOW VALVE FOR OBSTRUCTION- ALL FOUND CLEAR. A/C OK FOR SERVICE.