As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN DOOR WARNING LIGHT CAME ON ABOVE 10,000 FEET OR WHEN THE CABIN PRESSURIZATION WAS ABOVE 4.5 PSID. MAINTENANCE TRACKED TROUBLE TO 4 BAD DIODES IN THE RL-5 AND RL-6 CVR RELAYS. PART OF THE CVR CIRCUITRY IS SHARED WITH THE DOOR WARNING CIRCUITRY. THE CVR WAS INSTALLED AS PART OF A MAJOR ALTERATION. REPLACEMENT OF THE DIODES CORRECTED THE PROBLEM. (M)