What was found
SNA - FLT 1516 - THE NR 2 ENGINE WOULD NOT ROTATE ON START AND THE CREW REPORTED A MINOR EXPLOSION. INSPECTION OF THE NR 2 ENGINE REVEALED AN UNCONTAINED STARTER FAILURE WITH RESULTANT DAMAGE TO THE LT FAN COWL, NOSE COWL, AND CSD. THE NR 2 ENGINE STARTER WAS REPLACED IAW MM 80-11-01. THE DAMAGED CSD, LT FAN COWL, AND NOSE COWL WERE REMOVED AND REPLACED. IN ADDITION, THE CSD OIL COOLER AND STARTER SHUT-OFF VALVE WERE REMOVED AND REPLACED AS A PRECAUTIONARY MEASURE. THE NR 2 ENGINE WAS RUN AND OPERATION CHECKED GOOD. (X)