What was found
IN FLIGHT CREW NOTICED RT SIDE MAP LIGHT WOULD NOT EXTINGUISH. ON APPROACH TO DESTINATION CREW SMELLED AN ELEC SMOKE ODOR. CB RT PANEL, LT SIDE LIGHTS, POPPED & ODOR WENT AWAY. DID NOT RESET CIRCUIT BREAKER. REMOVED RT CB PANEL & FOUND CHART LIGHT RHEOSTAT ONLY WORKED ON HIGH & GROOVES BETWEEN SEGMENTS FULL OF BRUSH MATERIAL. CHART LIGHT INNER ASSEMBLY WOULD TWIST IN HOUSING MAKING RUBBER COVER TO BE REMOVED & CONTACT TO BE MADE WITH STRUCTURE DISENGAGING THE RT PANEL CB. NO DAMAGE TO STRUCTURE NOTED. REMOVED CO-PILOT CHART LIGHT RHEOSTAT PN E-125-R1-351, SN N/A & INSTALLED NEW RHEOSTAT IAW MM 20-21-03. PERFORMED OPERATIONS CHECK FOUND GOOD.