What was found
GOT GEN 1 OFF BUS CAS. WHILE RUNNING CHECKLIST. GOT GEN 2 OFF BUS CAS & GIA FAIL CAS SIMULTANEOUSLY ALONG WITH ALL OTHER ASSOIATED CAS MESSAGE. LOST PDF 2 & MFD ASSOIATED WITH ELECTRICAL EMERGENCY. RAN QRH, GOT GEN 2 TO COME BACK ON MOMENTARILY. GEN 2 OFF BUS ILLUM AGAIN. RE RAN CHECKLIST. GEN 2 STAYED ON UNTILL LANDING. UNABLE TD DUPLICATE TLTE DISCREPANCY, PERFORMED A SATISFACTORY OPERATIONAL TEST OF MAIN DC GENERATION SYSTEM JAW AMM 24-31-00. NO DEFECTS NOTED. PERFORMED GOOD WIRING CHECKS FROM LPDU TO GCU1, GS0123 & GS0133. NO DEFECTS NOTED. BOTH GCU'S AND TO REBUILD GS0123 & GS0133. R & R LPDU IAW AMM 24-65-01. DISCONNECTED, CLEANED, TREATED, & RECONNECTED GROUND STUDS IAW AMM 20·13•21, SEALED GROUND STUDS. INSTALLED 1 GCU ON LT SIDE IAW AMM 24·31-02. PERFORMED OPS TESTS ON LPDU IAW AMM 24-61· 00. NO DEFECTS, R & R RT GCU IAW AMM 24·31-02. BOTH GCU'S OPS CHECKED GOOD. ORIG SUBMISSION DATE: 9/8/2023.