What was found
ACFT TURNED BACK DUE TO FA'S & PAX REPORTING A BURNING ODOR AROUND ROW 5 TO 26-28. SMELLED LIKE A SOLDERING IRON. NO SMOKE VISABLE. FLT DECK DIDN'T DETECT ANYTHING. APU OFF. ALL ENG PARAMETERS NORMAL. PERFORMED INSP OF EXHAUST AIR TUBES, 72-59-82-210-810-A, INJECTION NOZZLE, AMM 72-59-00-210-801-A, EXHAUST TUBE SUPPORT, AMM 72-59-83-210-801-A, REAR VENT TUBE, AMM 72-59-00-710-801, EXHAUST TUBE, AMM 72-59-83-210-801-A, CONTINUE LP 680365 ITEM 3, & 2ND LP, CENTER TUBE VENT 9CVT, AMM 72-59-83-210-801-A. PERFORMED GAS PATH CLEANING IAW AMM 72-00-00-100-803-A, & PERFORMED LEVEL A DECONTAM OF ECS. IAW AMM 21-00-00-615-802-A. NO ODOR. ACFT OK TO CONTINUE.