Looking at your picture, I am sure that these are the Freightliner chassis relays.
These are temporarily strapped to the bare chassis by Freightliner and placed in the final location by the coach builder. These look like the same blocks as we had in our 2000 Holiday Rambler Endeavor. If we still had the coach I would go look for a number on the block but we have sold the coach.
If you have the cover for the damaged relay block, you will find a chart on the inside of the cover showing what the damaged relay should control.
I suggest that you call the Freightliner Help Desk at 1-800-FTL-HELP or 1-800-385-4357 and have the last 6 digits of your vin number available.
The help desk is a free service. The technician will be able to look at the wiring diagram for your exact chassis, and should be able to tell you the part number for that relay block. Freightliner parts at 1 864 206-8584 should be able to help you with the replacement part once you have the part number. I have not used the parts phone number in 2 years, but it is probably still the same.
I hope the above info will help.
Fred
Fred & Vicki
St. Augustine, Florida