These guys are the local Crossman/Benjamin service center. I've never used them, but might be worth a try...
ADDICTED 2 AIRGUNS 9195 W. EUCLID AVE. LITTLETON, CO80123 303-249-1726 dave@addicted2airguns.com www.addicted2airguns.com - CALL/EMAIL before dropping off gun for repair
Damn!!! Looks like he's out of business for a while, according to his website.