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You need to post 1 question at a time Geesh. Which answer did I give you did you not believe? Did you pull the codes? You gotta help yourself and provide info.
The door issue
Yes you can lube the lock slides although it is probably binding by the door handle button. You need to pull the door panel to do it. You need the factory service manual to do that or do some searches on it.
Did you check to see if the fuel pumps were compatible?
The SYS light flashing could be a low battery or your CCM could be have connectivity problems with various devices.
There is a bar that runs between the lock and the lock switch, theese are known to bind.
As Red said, you need to post related questions in a post and create others for other problems.