What was found
AIR TURN BACK DUE TO FUMES IN FLT DECK AND CABIN. INSPECTED APU PER TSM 21-00-00-810-801A. NO DEFECTS NOTED. CONTINUE TO TSM 71-00-81-810-805A. CHK BOTH ENG OIL ENG 1 AT 19.8 AND ENG 2 AT 19.1. DRAINED ENG 1 OIL OK AND RAN ENG 1 & 2 TO VERIFIED OIL AT PROPER LEVEL. VISUAL INSPECTED ENG 1 & 2 NO OIL LEAK NOTED. CONTINUED T/S PER TSM 71-00-81-810-805. PERFORMED 1 AND 2 BOROSCOPES PER AMM 72-00-00-200-812 NO DEFECTS NOTED. PER MCC REQUEST, INSPECTED HP6 IP8 PER AMM 36-11. NO DEFECTS NOTED. AS PRECAUTIONARY REPLACED 8 EA. RECIRC FILTERS PER AMM 21-21 E. C/W 1 AND 2 ENG BOROSCOPE IAW AMM 72-00-00-200-812 NO DEFECTS NOTED. R&R RT OZONE CONVERTER IAW AMM 21-58 OPS CK GOOD. WORK STILL IN PROGRESS. RAN PACKS WITH APU NO ISSUES. RAN PACKS FULL HOT AND COLD WITH EACH ENGINE INDIVIDUALLY AT IDLE AND TOGETHER AT 94% N3 NO ISSUES. A/C OK FOR SVC.