Buy a new one. I recently had a problem with a Epson Stylus C86, and checking with the local Epson authorised service agent was quoted £40.00 or there abouts for a repair and service check. Ended up in PC World and bought a new HP C3180 for £39.95.
The Epson still lays there waiting possible repair. Might have an attempt myself, as I previously saved £30.00 in cleaning out the waste ink tank myself (this might be your problem?). The only reason that I am considering trying a repair myself, is due to a large supply of replacement cartridges that I have for the C86.