Carefully check the relays for bent pins and the receptacles for any debris or damage.

I just removed my FPR a couple of weeks ago following a no-start condition. I did a careful inspection, but found no obvious issues, so I cleaned the pins with electrical contact cleaner... reinstalled the relay and it started right up.

I documented the above in the following thread:

http://www.peachparts.com/shopforum/tech-help/399783-sometimes-i-call-mercurial-benz.html

Duke