ir105 e00069-000 error

so far iv replaced the cw units, the hv dc transformer pcb assy, and have removed and reseated every plug on both boards dc controller included
machine is doing this intermintently. ran over 700 copies before it errored out again. anyone have any insight to this. customer wants this machine to run forever but I believe its on its last legs. has over 2,500 thousand copies on it and I have been using bandaids to keep this thing running. any insight would be greatly appreciated