As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DETECTED AND SAW SMOKE IN COCKPIT. SMOKE OBSERVED COMING FROM LOWER RT SIDE OF INSTRUMENT PANEL. TURNED OFF BATTERY SWITCH. DIVERTED FOR UNEVENTFULL UNSCHEDULED LANDING. DETERMINED THAT A DIODE TO THE ACFT CLOCK BACK LIGHTING SYS HAD OVERHEATED ANF MELTED ITSELF AND A TY-WRAP THAT SECURED THE WIRE HARNESS TO A STANDOFF ASSY. DISABLED CLOCK BACK LIGHTING SYS AND DEFFERED.