What was found
LHR - FLT 87 - ON DESCENT, LEFT GENERATOR FAILED, WOULD NOT RESET. OK TO CONTINUE PER MEL 24-3 AUTH 8-84DC-C. LEFT IDG UNUSABLE. CHECKED AND SERVICED APU OIL, LEFT AND RIGHT IDG, COMPLIED WITH MPM 24-3. IDG DISCONNECTED. 120 MINUTES RULE APPLIES. DEFERRED DUE N/S REQS GEN 0002 ENT IN MIC SHEET. REPLACED LEFT IDG PERFORMANCE CHECK ACCOMPLISHED SYSTEM CHECK GOOD. REMOVED MEL 08-84DC-A REF 2504 CLEARED MIC. (M)