The EO-2 crew conducted an emergency EVA on April 11 to investigate the problem. The crew found a piece of debris, probably a trash bag, that was left by Progress 28. After removing it, Kvant-1 was finally able to achieve a hard dock with the station on the same day. The Kvant-FSM, which contained the now unneeded propulsion of the Kvant-1 module, was finally jettisoned on April 12, revealing Kvant-1's rear docking port.