What was found
STRONG ODOR OF SIMILAR TO BURNING ELECTRICAL, 3 HOURS INTO FLIGHT LASTING APPROXIMATELY 4 MINUTES, ROWS 22-27, PRIMARILY A/C RT TURNED POWER OFF TO READING LIGHTS ENTIRE CABIN, INCLUDING GALLEY POWER. ORIGINAL PROBLEM WAS 14-17 ABCEG READING LIGHTS INOPERATIVE. TURNED ON ALL READING LIGHTS AND IFE THRU ALL CABIN. INSPECTED LIGHTS AVU'S NO ODOR NOTED. OK FOR SERVICE.