As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING PRE-FLIGHT INSPECTION, MAINTENANCE PERSONNEL NOTICED A BURNING SMELL COMING FROM THE RIGHT AUDIO PANEL. INVESTIGATION REVEALED THAT THE LIGHTING CIRCUIT IN THE SUBJECT CONTROL HEAD HAD SHORTED DUE TO WATER CONTAMINATION. THE SUBMITTER DETERMINED THAT THE WATER CAME FROM A LEAKING EMERGENCY ESCAPE HATCH SEAL.