Trace protocol main mission help

[BigDaddyDanger]

I have beaten the mean mission trace protocol and some how I did not pick up the pocket mech, when I head back to REZDEV to the door located in the kitchen area. I head down stair towards the location, the diamond shape yellow mission marker appears at the back of the room but the door is locked and i cant get thought, I should mention I have beaten the game, I've tried even heading back to the dream world club to the start of the mission. nothing. thanks friends any help would be most excellent