As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
POST C-CHECK MAINTENANCE EVALUATION FLIGHT. CLIMBING THROUGH 10,000' VMO POINTER/BARBER POLE FAILED TO INCREASE SPEED TURNED OFF A/T TO CONTROL SPEED. AIRCRAFT PERFORMED AN AIR TURN BACK (ATB). AIRCRAFT WAS GROUNDED. FOUND VMO/MMO SWITCH IN ALT POSITION MOVED SWITCH TO THE NORMAL POSITION IAW B767 AMM 32-00-00. AIRCRAFT RETURNED TO SERVICE.