[R-390] R390A antenna relay troubleshooting

[peter murphy]

Hi all,
I have a nice Chuck Rippel restored R390A that has been working fine for about 18 years. One day recently it stopped receiving as if the antenna was disconnected.  No calibrator signal either.  Then I noticed the familiar relay "click" was gone as I switched to STANDBY or CAL.
My first inclination is to remove the relay and clean the contacts.  Before I do this I wanted to check with you folks and see if I am going down the right path on this.
BTW I also have a second R390A that is working FB.  Maybe swap the relays and see what happens?
I notice there is a replacement relay on eBay right now, wonder if these are hard to find and if I should snap it up while one is available.  $25+ shipping
Thanks for any help on this.
73,  Pete  W6WY near Redding CA