Be nice to your VMPS speakers. There's not much in the way of repair options. But, maybe contact Pat M. for spare parts. He's advertising on CL about having a number of WCF woofers available for sale.
Also, an easy way to trouble-shoot suspect drivers is with the cardboard center tube, from a roll of paper towels. It makes a great stethoscope, for listening to individual drivers. Easy to hear which one is broken, through the tube. Once you've found the suspect, swap it into the other speaker, to ensure it's the driver and not a crossover issue.
Finally, when you get the RDS up and running again, set it to small in your surround processor. It'll last longer that way...!