My BK2K has been working awesome after cleaning the drop targets. Now the upper playfield flipper is working extremely slow (everything looks to be connected under the playfield). The lower playfield flippers both seem to be working fine (although maybe they could work better with a rebuild). I am assuming after reading numerous posts, it is time for a flipper rebuild. While at it, should I rebuild the two lower playfield flippers at the same time? Anything look incorrect in these pictures? Its obvious with the solder that this flipper assembly has been worked on at some point.DSCN0635.JPG DSCN0636.JPG DSCN0637.JPG