As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT NOT GROUNDED: CABIN PRESSURIZATION FLUCTUATING IN BOTH SYSTEM 1 AND SYSTEM 2 CABV/S +- 300 FPM. CAB ALT STABLE FOR MOST PART +- 50 FT. PERFORMED TEST OF CABIN PRESSURE CONTROLLER #1 AND #2 IAW AMM 21-31-00-710-002-A. TEST OK NO FAULTS NOTED.