What was found
AIRCRAFT WAS GROUNDED: DURING PRETAKE-OFF RUN UP OF ENGINES. ADVANCED BOTH ENGINES TO THE 50% POSITION ENGINE NO.1 ACCELERATED NORMALLY BUT ENGINE NO.2 LAGGED BY MORE THAN 50 PERCENT AFTER BOTH ENGINES STABILIZED ADVANCED TO FIX/MCT WAS NORMAL. NO OTHER ABNORMAL INDICATION ON TAKE OFFOR CLIMB. ACCOMPLISHED FIM TASK 71-00-00 FOR SLOW ACCELERATION. ALSO ACCOMPLISHED FADEC TEST, POST FLIGHT REPORT. LAST LEG REPORTS AND TROUBLESHOOTING REPORTS. NO FAULTS NOTED. ENG ACCELERATED NORMAL IAW MM 71-00-00-710-025A.