As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT WOULD NOT PRESSURIZE IN FLIGHT. RAN E & A CHECKLIST, STILL WOULD NOT PRESSURIZE. RETURNED TO FIELD. LANDING UNEVENTFUL. FOUND WIRES 2131-102A-22-4 AND 2131-148A-22-4 CROSSED. RETERMINATED ACCORDING TO WM 46-30-01 HS 46-002. WIRE RINGS OUT GOOD. CDS SHOWS NO PRESENT FAULTS. RETURNED TO SERVICE.