Many on here have rebuilt them themselves & said they are easy to repair.
I have a Crosman 140 & a Crosman 1400 that need rebuilding...might be good weekend warrior projects.
I believe Baker Airguns https://www.bakerairguns.com/repair-restoration/), or Precision Pellet http://www.airgunshop.net/contactus.html), or AB Airguns http://www.abairgun.com) have parts or can handle the repair.
Parts can be bought many places, like JG Airguns:http://www.jgairguns.biz
Here is a post on rebuilding one:http://www.airgunhome.com/agforum/viewtopic.php?t=8012
Here is a repair manual:http://stevespages.com/pdf/crosman_factory_service_manual_all.pdf
Truth is Stranger than Fiction.....