I then put my attention to the four power jumper cables attached to various track pieces along the lap and the very first one I checked had a disconnected terminal on the outside lane:
I fixed this and checked the other three which were fine. I then checked the extra power cables which I had soldered to the power base track section to take power to the power collection blocks and, aside from a bit of cleaning of under-track dust and other residue, there was no need for any more work in this area:
I then finished off the work by wiping the whole track surface with a dry cotton cloth to remove dust, cleaned the track rails with isopropyl alcohol, applied a coating of Inox to them and re-painted the start line and pit lane lines (forgot to take a pic, but you'll see the results this Thursday).