RM also uses the old "Pridemark" VHF channels and uses RMA 1 and 2 in Aurora (911 only). Interestingly, after over a year of working there, I never could get either RMA 1 or 2 to work in my scanner. Never could figure out why.
The "Boulder" vhf channel which, last I heard, was actually down in Littleton and completely out of service. The "Denver" vhf Channel is what they use internally for their 911 responses in Wheatridge/Fairmont. They also hop on MARC (IIRC) for those. The "Admin" vhf channel is used for their IFT's. They have cell phones they use as well, used primarily for alerting aurora crews at night when they have a call, and day to day admin stuff.
My guess, and it's only a slightly educated one, is that Falck will be given access to RMA 1 and 2 (And probably rename them) as well as the Aurora FD channels. I can't see Aurora allowing RM to continue to access their system for any reason.
AMR, if they're smart, will probably move all the RM rigs to their 900mhz trunked system. I don;t think any of the RM radios were capable of 900, so it'd be pricey to do, but worth consolidating the unnecessary amount of channels they are accumulating.