What was found
IMMEDATELY AFTER TAKEOFF, HAD A STRONG BURNING RUBBER ODOR FOR ABOUT 1 MIN. ALL INDICATIONS NORMAL. NO APPARENT SOURCE NOTED. TROUBLESHOT IAW FIM 21-22-00-810-811, NO FAULTS FOUND. APU INLET CLEAN, ACMS OIL GOOD. PERFORMED HIGH PRESSURE DUCT BURNOUT IAW AMM 21-53 - REPLACED COALESCER BAGS IAW AMM 21-54, NO ODOR OR SMOKE NOTED. ACFT OK FOR SERVICE.