Hello solnyc2,

I'm sorry to hear of your continued problem. My CEL went away after replacing my fried pump, I disconnected the battery for about 20min and every thing has been alright since then. Now I'm no expert but I believe you problem is down to one of the following:

1) New Air Pump is functioning intermittently
2) Ground cable on pump has corrosion (needs a good clean)
3) The contacts on the plug connected to the pump need a clean
4) Check the big 40 amp orange fuse on the top of the RCM (mine was blown, although you say your CEL is intermittent so unlikely to be this)
5) Faulty RCM - it may look alright but it is still a problem part
6) May just need a reset - disconnect the battery for a while and reconnect
7) Faulty air pressure valves - the 2 metal ones on either side of the pump - although I have not heard of these going wrong before

Have you heard the new pump running? should come on when you start the car first thing in the morning, sounds like a vacuum cleaner. If not check that there is a current passing through the live wire on the plug connected to the pump.

I bought my new pump from Ebay too and it was genuine as far as I could tell, there are a few companies that recondition them to sell. I think the stealership are trying to make money out of you - no suprise!

I hope this helps.

Regards

AR