What was found
BOI - DURING TAKEOFF ROLL, THERE WAS SMOKE SMELL IN CABIN. NO PRESSURE ABOVE 3 PSI, DUCT PRESSURE 10 PSI WITH ANTI-ICE ON. MAINTENANCE GROUND RUN AIRCRAFT, ENGINE 1 AND 2 SAME ACCELERATION RATE. RAN BOTH AT HIGH POWER, NO SMOKE SMELL IN CABIN. AIRCRAFT PRESSURE TO 4.0 PSI, AFT PRESSURE DROP. CHECK OK, NO PARTS REPLACED.