I have a 2001 excursion and the power door locks do not always work, is there an easy fix?

I have a 2001 excursion and the power door locks do not always work, is there an easy fix?
Does all lock functions fail?
Or can you use a different switch to get the locks to operate?
The problem may be a sticky relay: there are three, Driver's unlock, all lock and all unlock.
And, do the remotes still function?