As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURE WARNING LIGHT ILLUMINATED IN FLIGHT AT 10,000 FT. CABIN ALTITUDE INDICATED 12,000 FT. RETURNED TO THE FIELD AND DECLARED AN EMERGENCY. LANDED WITHOUT INCIDENT. MX PERFORMED AN ADJUSTMENT TEST OF THE CABIN PRESSURE SWITCH. ALL OPS CHECKS PRODUCED SATISFACTORY RESULTS.