What was found
DURING CRUISE, RT GEN TIE OPEN, CAUTION LIGHT & ANNUNCIATOR LIGHTS ILLUMINATED. ABNORMAL CHECKLIST, FOR RT GEN TIE OPEN, WAS ACCOMPLISHED. A BUS RESET WAS PERFORMED. RT GEN TIE OPEN, CAUTION & ANNUNCIATOR LIGHTS ILLUMINATED AGAIN AFTER 45 SECONDS. AUTO PILOT DISENGAGED, FIRST OFFICERS PFD WENT BLANK & FIRST OFFICERS COMMUNICATION WAS INTERMITTENT. AN EMER WAS DECLARED & AN EVENTFUL LANDING WAS PERFORMED. DEFERRED THE GEN BUS TIE RELAY SYS IAW MEL & THE ACFT REPOSITIONED TO THE SERVICE CTR GEN BUS TIE MEL MX. INSPECTED BEHIND CB PANELS & PCB A257 WITH NO DEFECTS NOTED. PERFORMED BUS CONFORMITY CHECK WITH NO DEFECTS NOTED. REMOVED & SECURED PCB A257. PERFORMED SUCCESSFUL OPERATIONAL CHECK. ACFT WAS RETURNED TO SERVICE 11 15 2017. NO REPEAT SQUAWK SINCE RTS.