What was found
REPEAT WRITE-UP L GEN OFF EICAS ON APPROACH. RUN CHECK LIST AND RESET THE L GEN CONT SWITCH AND GENERATOR CAME BACK ON LINE. DECLARED EMERGENCY. ALL INSPECTIONS SATISFACTORY. RECONNECTED L IDG PER AMM 24-11-01-6. OPENED & CLOSED L ENGINE FAN COWLS PER AMM 71-11-04-2. PER MTSI 24-10/5724, REMOVED & REPLACED L GCU IAW AMM 24-22-02-4. RESET BPCU & PERFORMED BITE TEST PER FIM 24-20 TASK 804. ALL TESTS SATISFACTORY. RAN BOTH ENGINES PER JRH WITH FULL ELECTRIC & PNEUMATIC LOAD. ALL ELECTRICAL LOAD PARAMETERS ON L ENGINE NORMAL. NO FAULTS NOTED. PERFORMED BPCU BITE TEST AFTER EGR. NO ABNORMALITIES NOTED. A/C OK FOR SERVICE