What was found
(CAN) UPON TAKEOFF AND BEFORE REACHING 40 KTS WHILE AT 30 FT HEIGHT, NR 2 ENGINE TOT, TORQUE AND N1 OSCILLATES BETWEEN 8-11 FLI, FLIGHT LIMIT INDICATOR, WITH A GONG SOUND AND NR LIGHT COMES ON AND OFF. NR 1 ENGINE TOT, TORQUE AND N1 DECREASES. THE PILOT LANDED SAFELY. PERFORMED BOTH ENGINES DCU DOWNLOAD. NOTICED THAT AN N2 EXCEEDENCE WAS RECORDED ON NR 2 ENGINE AND REACH 115.66 PERCENT. NO EXCEEDENCE WAS RECODED ON 1 ENGINE. IT WAS RECOMMENDED TO REMOVE THE ENGINE TO FOLLOW THE REPAIR WORKSCOPE.