What was found
ABORTED TAKE OFF DUE TO A LEFT ENGINE PYLON BLEED LEAK CAS MESSAGE AND SMOKE IN THE COCKPIT/ CABIN. UPON INVESTIGATION THE LT ENGINE OTBD PRECOOLER V-BAND COUPLING WAS LEAKING. REMOVED THEN REINSTALLED AND TORQUED IAW 750AMM20-10-40, CAL TOOL: JEG9133 DUE 4/22/2026. LEAK CHECKS GOOD AT THIS TIME. ACCOMPLISED HIGH POWER ENGINE RUNS IN REF TO C750 MM 71-00-04. NO DEFECTS NOTED. SMOKE IN THE COCKPIT. ACCOMPLISHED HIGH POWER ENGINE RUNS. IN REF TO C750MM71-00-04. NO DEFECTS NOTED.