What was found
NR 2 ENGINE OIL FILTER ALERT. DID NOT EXTINGUISH. SHUTDOWN ENG 2 IAW QRH. DTW R IN WORK AT THIS TIME. REMOVED, REPLACED AND INSPECTED SCAVENGER FILTER ELEMENT IAW MM 79-20-02-2 AND FOUND NO CONTAMINATION. ALSO REMOVED MASTER CHIP DETECTOR AND FOUND NO CONTAMINATION. ACFT REQUIRES ENGINE RUN FOR LEAK CHECK AND THE NR 2 ENGINE PLATFORM TO BE CLOSED. CFDS FAULT REVIEW AND FAULT HISTORY OF AIU 2 SHOWED INTERNAL FAULT. REMOVED AND REPLACED NR 2 AIU IAW M/M CH 31-43-02-4-0. OPS TEST GOOD IAW MM CH 31-43-02-5-0. R-T-S PASS ON ALL 3 AIU. NR 2 ENGINE GROUND RUN UP OPS CHECK AND LEAK CHECK GOOD. CLOSED NR 2 ENGINE COWLINGS AND WORK PLATFORM. OK FOR SERVICE.