What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: ON CLIMB BETWEEN FL260 AND FL300 WITH ENGINE ANTI-ICE ON. THE NR 1 ENGINE THRUST LEVER WAS A FULL KNOB FORWARD OF THE NUMBER TWO ENGINE. THEN AFTER A WHILE IT WAS A FULL KNOB BEHIND. THE THRUST LEVERS CONTINUED TO BE SPLIT FOR THE REMAINDER OF THE FLIGHT ABOUT. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. ACCOMPLISHED THRUST LEVER NOT ALIGNED FOR SAME N1 ON BOTH ENGINES, PER FIM 76-05-00-810-801-F00 AND ACCOMPLISHED POWER RUNS, PER AMM 71-00-00 NO FAULTS FOUND AT THIS TIME. N1 AND THRUST LEVELS ALIGN NORMAL AT THIS TIME.