What was found
LTO - ODOR IN CABIN COMING FROM BIN OVERHEAD ROW 1. T/S TO CEILING LIGHT POWER UNIT DIMMER AT ROW 1A, B. DISCONNECTED POWER UNIT DIMMER. PERFORMED OPS TEST OF PASSENGER COMPARTMENT LIGHT PER AMM 33-21-00-710-801. NO ODOR OR DEFECTS NOTED. OPERATED PACKS WITH APU. NO ODOR NOTED. GROUND RAN ENGINES WITH PACKS ON. NO ODOR NOTED. 7/30 MEL CLEARED BY FINDING POWER UNIT/ DIMMER BECOMING HOT. REMOVED AND REPLACED ROW 1 SEAT A-B POWER UNIT/ DIMMER WITH NEW IAW CRJ AMM TASKS 33-21-03-000-801-A01 AND 33-21-03-400-801-A01 OPS CHECK GOOD CLEAR MEL 33-21-1. RETURNED TO SERVICE.