What was found
THE FLIGHT CREW REPORTED THAT DURING PERFORMING TR CHECKS PRIOR TO TAKEOFF RECIEVING A LH REV FAULT CAS MESSAGE. THE MESSAGE COULD NOT BE CLEARED. OPERATIONS WERE CONTIUNED PER MEL 78-30-01-02. DURING THE MAINTENANCE EVENT THE MX TEAM TROUBLESHOT AND DETERMINE THE INBD AND OTBD LATCH/UNLATCH SWITCHES (S2 AND S4) WERE FAULTY AND WERE REPLACED WITH NEW SWITCHES. RIGGING AND OPS CHECKS WERE SATISFACTORY. THIS CLEARED THE MEL AND THE AIRCRAFT WAS RETURNED TO SERVICE.