As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA- ON FLIGHT 2330 AIRCRAFT RETURNED TO FIELD. WHILE CLIMBING THROUGH 17,500 FEET CABIN PRESSURE WARNING LIGHT ILLUMINATED. CABIN PRESSURE WAS NORMAL. CABIN ALTITUDE 4000 FT AND CABIN DIFFERENTIAL 5.2 PSI. ALL BLEEDS, VALVES AND DOORS NORMAL. FOUND WATER/CONDENSATION ON CONNECTOR 2. CLEANED CONNECTOR. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.