What was found
FAINT OIL BURNING OR PNUMATIC BURNING ODOR EMERGED ENROUTE, CONDITION BECAME WORSE DURING DESCENT. NO SMOKE PRESENT IN COCKPIT. PERFORMED AIR CONDITIONING CONTAMINATION TASK SUGGEST ODOR POS ORIGINATING FROM OVER FILLED ENGINE OIL SYSTEM 23QTS IAW FIM 21-00-01, PGBK 301, STEP 1C, 1, B. PERFORMED ODOR REMOVAL IAW AMM 21-00-01-002-001, SUB TASK 862-016. NO ODOR NOTED.