As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF OUT OF PHX CREW NOTICED CABIN DOOR LIGHT ON, CREW TRIED TAPPING WARNING LIGHT CAPSULE, NOTICED SOME SMOKE COMING FROM THE DOOR LIGHT CAPSULE. RETURNED TO PHX WITH NO PROBLEMS. MAINTENANCE FOUND DOOR WARNING LIGHT CAPSULE SHORTED. DISCONNECTED WIRE, MEL'D DOOR WARNING LIGHT AND RETURNED TO LCK. RECONFIGURED WARNING LIGHT PANEL TO USE A SPARE CAPSULE FOR THE DOOR WARNING LIGHT.