What was found
FLAPS 20, SELECTED MLG DOWN. RECEIVED A RED HANDLE & LT / RT GEAR UNSAFE & NLG UNSAFE CAS MESSAGES & LT HYD LOW CAS MESSAGE. LT HYD INDICATED 1.8. PROCEEDED WITH LT HYD LOW CHECKLIST, NO CHANGE IN QTY. PROCEEDED TO MLG EXTEND CHECKLIST. USED EMERGENCY MLG HANDLE, MLG EXTENDED & PROPER INDICATION ACHIEVED. EMERGENCY MLG EXTENSION BOTTLE DISCHARGED, EMERGENCY GEAR EXTENSION HANDLE PULLED & MLG CONT CIRCUIT BREAKER TRIPPED. LANDING UNEVENTFUL, HYD QTY BACK TO NORMAL ONCE MLG EXTENDED. REMOVED DEFECTIVE MLG HYD SELECTOR DUMP VALVE & INSTALLED AN INSPECTED MLG HYD SELECTOR DUMP VALVE. OPS CHECKED GOOD. NO DEFECT NOTED. WORK ACCOMPLIED IAW MM 32-30-03.