Arrived at location on 6/21/23 - Inspected unit and operation. Found that sparks seen were from worn out brushes on motor. Removed, cleaned, and reinstalled. Will order new brushes and install. Unit in service but requires parts. Returned to location on 7/7/23 - Shop work. Removed bottom to access the brushes. Removed worn brushes and installed new. Reassembled all. Tested ok. Back in service.