What was found
BURNING ODOR IN CABIN AND FLIGHT DECK, NO VISUALLY SIGNS OF SMOKE. ALL BLEEDS NORMAL. RETURNED TO FIELD. REMOVED FROM SERVICE. COMPLIED WITH FIM 21-20-00-810-802. AS A PRECAUTION, PREFORMED ENGINE PRFORMANCE RECOVERY WASH POST RUNS IAW MM 72-00-00, CLEANING. ODOR DISAPATED, NO FURTHER ODOR NOTED IN CABIN OR FLIGHT COMPARTMENT. RETURNED TO SERVICE.