What was found
YELLOW BLEED 1 FAIL CAS WHILE WAITING FOR TAKEOFF. PERFORMED THE QRH PROCEDURE AND WAITED AN ADDITIONAL 15 MIN WITH THE SWITCH IN AUTO, CAS WOULD NOT CLEAR. ARRIVED AT AIRCRAFT AND PERFORMED CMC DOWNLOAD, THEN REMOVED LT PRSOV ACCESS PANEL ON PYLON AND PHYSICALLY CHECKED VALVE. VALVE STICKS AND IS HARD TO MOVE: TROUBLESHOT USING FIM-36-11-00-810-809-A - FAILURE OF LH PRSOV AND REPLACED VALVE SUCCESSFULLY OPS CHECKED IAW PHENOM 300 AMM 36-11-01. AIRCRAFT RESTORED TO ORIGINAL CONFIGURATION.