What was found
FLT#1971, LGA-FLL. 'VERY STRONG ODOR/FUME ON DESCENT AND FINAL. SMELLED ACRID OIL COMING OUT OF BLEEED SYS WITH AND WITHOUT APU; ACCOMPLISHED TSM 05-50-00-810-831-A, FOUND TO BE THE APU. PERFORMED SUBTASK 05-50-00-810-085B. COMPLIED WITH INFO NOTICE 2017-T015, SECTION 'A", ISOLATED TO APU, APU TO BE PLACED ON MEL. AIRCRAFT OK FOR SERVICE. PERFORMED ECS DECON 9 WITH ENGINES), NO ODOR WAS DETECTED.