What was found
ON CLIMBOUT REAR F/A CALLED COCKPIT STATING SHE SMELLED ELECTRICAL ODOR, ELECTRICAL BURNING ODOR POSSIBLY. 2ND REAR F/A CONFIRMED SAME. RETURN TO DEPARTURE. FIRE DEPT PERSONNEL CAME ONBOARD AFTER ORDERLY DEPLANNING OF PASSENGERS. THEY SMELLED RESIDUAL ELECT ODOR FROM ROW 18-25 WITH APU OFF AND ALL ELECTRIC OFF ACFT. C/W TC 21-059-002, TYPE 3, NO DISCREPANCIES NOTED. REPLACED COALESER BAG IAW AMM 21-20-02. OPERATED AIR CONDITION SYS, NO ODORS NOTED. CHECKED OIL IN APU AND AIR CYCLE MACHINE. ALL CHECKS GOOD.