What was found
DTW - FLT 313 - AFTER START AND PRIOR TO TAXI, RIGHT ENGINE N2 DROP TO 44 PERCENT, N1 19 PERCENT, AND EGT 535 DEG. RETURNED TO GATE. NR 2 ENGINE REQUIRES CHANGED IN REF TO LOG PG 91117-1. REMOVED AND REPLACED NR 2 ENGINE IAW MD80 MM 71-00-00. LEAK CHECKED GOOD. (M)