As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STIFF RESISTANCE FELT ON THROTTLE LEVERS. SLOW ACCELERATION AND RESPONSE DURING TAXI. A/C RETURNED TO THE GATE (BTB). MTX ACCOMPLISHED ACCELERATION AND DECELERATION TEST IAW B767 AMM 71-00-00. BOTH ENGINES WITHIN LIMITS. CYCLED THROTTLES MULTIPLE TIMES, NO RESISTANCE NOTED. A/C REMAINS NO ETOPS. RETURNED A/C TO SERVICE