Just finished checking and rebuilding 2 used sets and added them to my store
inventory.
The sets are :
5571 Giant truck
42100 Liebherr R 9800
I think I am going to experiment with removing discolouration from used parts,
just to see if I can do it. The 5571 sets I buy have most of the time discoloured
parts. Especially the grey parts where the sticker is on.