I had good luck with this stuff years ago in another situation, and it seems to have solved my issues this time.
Amazon.com: deoxit 5
I was getting a P0410 code every 6 months or so. It got more frequent, with 2 in a day being the last straw.
I used it on the male & female ends of the 2-pin pump connector, the small connector at what looks like a solinoid valve with the blue vacuum check valve next to the pump, the big fuse at the RCM and the ground wire under the bolt head on the pump.
It helps to spray it into the cap and apply it with cotton swabs with 1/2 the cotton removed, especially in the female sides.
I waited a while to post this, and no code so far!