What was found
FLT 4129 - DURING CLIMB-OUT CAPTAIN NOTICED SMOKE COMING FROM THE LOWER INTSTRUMENT PANEL. CREW ELECTED TO RETURN TO THE FIELD. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. SUBSEQUENT INVESTIGATION BY MAINTENANCE PERSONNEL REVEALED WATER UNDER LIGHT PANEL CAUSING SHORT CIRCUIT. FURTHER INVESTIGATION FAILED TO REVEAL SOURCE OF WATER. WATER WAS CLEANED FROM LIGHT PANEL AND AIRCRAFT WAS RETURNED TO SERVICE. (W)