What was found
DURING GEAR RETRACTION IMMEDATELY AFTER T/O LT MLG FAILED TO RETRACT. CAS MESSAGE GEAR DISAGREE L DISPLAYED ACCOMPANIED BY A SLIGHT LT YAW AND ASSOCIATED GEAR IN WINDSTREAM NOISE. ON GEAR INDICATOR SECTION OF MFD THE LT GEAR DN IN YELLOW AND NOSE UP & RIGHT MAIN UP IN WHITE DISPLAYED. MLG WILL NOT RETRACT QRH WAS ACOMPLISHED & AT COMPLETION ALL 3 GEAR INDICATORS DISPAYED IN GREEN & GEAR DISAGREE L CAS MESSAGE EXTINGUISHED. NORMAL FULL FLAP LANDING WAS ACCOMPLISHED. REMOVED SUSPECT FAILED LT MLG SHUTTLE VALVE & INSTALLED OVERHAULED SHUTTLEVALVEPN. ALL POST MX CHECKS COMPLIED WITH NO DEFECTS NOTED. WORK DONE IAW AMM 32-32-35.