What was found
AIRCRAFT WAS NOT GNDED. FLIGHT ATTENDANT REPORTED ODOR, INTERMITTENT, AROUND ROW 26, MAYBE ELECTRICALISH, TURNED CABIN FAN OFF, ODOR DISSIPATED & DID NOT RETURN. 2 HOURS LATER FLIGHT ATTENDANT SAID SMELL RETURNED BUT DISSIPATED AGAIN AFTER A MINOR TWO. PERFORMED CABIN AIR QUALITY JC 26L0021001 & ISOLATED TO SIDEWALL LIGHT BALLAST AT ROW 26 LT. R & R BALLAST & RELAMPED IAW AMM 33-21-11.