This sounds like a bench warrant was issued. A bench warrant is only good and enforceable within the borders of the state in which it was issued. From a practical standpoint, so long as you never returned to Colorado, they could not do anything to you. However, a bench warrant NEVER expires. Thus, if you go skiing and stop at a road block, get pulled over, etc., you'll be arrested for the outstanding warrant.
The warrant was issued for contempt for not showing up. It is likely that you could settle this whole thing for much less than $7500.
My suggestion is to contact a criminal defense attorney in the county where the court that issued the warrant is located and have him/her review your file and help you resolve this issue. It is very likely that you can appear, pay a much smaller fine and be back on your way to California.
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