Under your Epson Stylus Pro 7880’s printer head are two foam pads to keep the wiper blade and the pump cap. Check these for debris and remove any large pieces of debris you find.
Make sure these pads are moist. If they feel dry you should moisten then with distilled water. I used a syringe and slowly moistened the pads completely.
The Epson site actually has a very nice tutorial HERE. Keeping these two pads clean and moist can also resolve other issues: smeared ink and droplets on prints.