If your countertop is corian it can be repaired. If it is craqcked that is often caused by using a long screw underneath the corian to attach something to it. to find a company to repair do a ggogle search for corian repair near your location.
And Corian used to have a 10 year warranty! On my 96 Hitchhiker Champagne, they sent a repairman out to fix the 6 year old Corian top on the bar that had cracked! No charge to me. Check your papers that came with your rig. Good luck!
Yep thats the stuff we have. It was all replaced under warranty as we developed spider cracks around the sink drains. The company went to an "improved" formula and the colors didn't match so our Dealer did it all.
(I noticed the second picture on their website is a 2007 Montana 2955RL)
You can probably get it repaired, but I don't know if the repair will blend to the point you can't see it like Corian. If mine had issues again, I would probably just replace it all with Corian. I could even order the pieces in Corian because they use it in my model now.
Good luck with the fix - That kind of stuff is dis-heartening, expecially if you like your RV.