Your nomenclature is erroneous! There are no removable cups in these frames. The bearing, which is what you are calling the cup is shot and, depending on the tolerances of the frame can either be popped out with your fingers, or if tight, driven out from the other side using a long blade screwdriver and some gentle taps with a hammer. Bontrager makes a special and very inexpensive tool for this, but I doubt you need it.

Bearings are sold in pairs at your Trek dealer for about $20.