As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRSPEED INDICATION ON BOTH CAPT'S AND FO SIDES LIMITED TO 265 KTS PER CREW REPORT. ON ARRIVAL, INSPECTED E&E COMPARTMENT AND FOUND S591 ALTERNATE VMO/MMO SWITCH IN ALTERNATE POSITION. THIS POSITION LIMITS VMO/MMO BARBER POLES. POSITIONED SWITCH TO NORMAL AND SAFETIED SAME. NO FURTHER DEFECT NOTED.