E33 (with 4) transferred to Co. 52 (Shippensburg) at 16:57 while they operated on a Mountain Fire. E33 responded to a smoke investigation inside a commercial building, with Co. 52, 49, and 53, on E King St in Shippensburg at 23:32. Crews traced the incident to discarded cleaning rags that spontaneously combusted in a container in the kitchen. E33 returned to Station 33 by 01:30. Station 33 remained staffed while the Engine was committed.