Parts for PSE Viper Copperhead TS

[slowjo]

Hi, I'm looking for replacement parts for a PSE Viper Copperhead TS. I was told by a PSE parts expert from PSE customer service, they don't carry parts for older crossbows. I need a spring and other parts for the scope mounting rail/rail adjustment.
Can anyone here help me out? Suppliers, experts, used parts, parts lists, etc.
Thanks