What was found
CABIN DIFF. DROPPED TO ZERO UNABLE TO CONTROL IN AUTO OR MANUAL MASK DEPLOYED, CLEANED/REPLACED 3 DRAIN VALVES OPS CK GOOD
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
CABIN DIFF. DROPPED TO ZERO UNABLE TO CONTROL IN AUTO OR MANUAL MASK DEPLOYED, CLEANED/REPLACED 3 DRAIN VALVES OPS CK GOOD