Hi. I have a friend with a Trek 820 hardtail mtn bike. He lives in an apt. and left his bike on the patio...and it was rained on. Now his front fork is siezed, although there is no visible rust. Any suggestions on how to attempt to break it loose without damaging anything? I'm not familiar with the internals of his suspension...I think it's a RST 191 C7, 63mm. We need to get this thing moving again so we can ride this weekend. Thanks!