What was found
FLIGHT: 9180, DURING FLIGHT, STRONG BURNING RUBBER ODOR WITH RT BLEED AIR VALVE OPEN, GOES AWAY WHEN VALVE IS CLOSED, HAPPENS ONLY IN FLIGHT. INSPECTED FUEL LINES ,OIL LINES BYPASS AND THRU VALVE PERFORMED RUN UPS AT 90 PERCENT WITH BLEEDS ON NO DISCREPANCY FOUND. TEST FLIGHT SATISFACTORY. SUSPECT RESIDUAL ODOR FROM PREVIOUS BURNING ODOR ITEM.