What was found
RETURNED TO DEPARTURE DUE TO A LOSS OF PORTION OF LEFT BUSS. TROUBLESHOT AND INSPECTED HARNESS AND IDG, NO FAULTS. FOUND A CIRCUIT BREAKER TRIPPED AT THE P31 PANEL, RESET. R & R THE GCU IAW AMM 24-22 AND BPCU IAW AMM 24-41. REPLACED THE CIRCUIT BREAKER C313. ALL ELECTRICAL CHECKED GOOD. FOUND OIL LEAK AND REPLACED DEOILER OIL SEAL. REPLACED CT T105 IAW 24-31. OPS AND LEAK CHECKED GOOD.