What was found
GRR - FLT 4288 - DURING TAKEOFF FROM GRR, EXPERIENCED BRIEF LOSS OF POWER REQUIRING FLIGHT CONTROL CORRECTION. POWER LOSS WAS NOTICEABLE, BUT HAPPENED TOO BRIEFLY TO BE NOTICED ON ENGINE INDICATION. MAINTENANCE GROUND RAN AIRCRAFT AND RE-TRIMMED BOTH ENGINES. AIRCRAFT RETURNED TO SERVICE. (X)