I have a passion for taking an old Loco - especially a Proto2000 and giving it a new life. I completely tear them down, clean, lube, regear, then add RP modules to some. Just about everyone- New in the box, had all 4 gears cracked. Also had the gummy brown grease, stuck bearings on the worm gears ... complete cleaning with IP and a tooth brush ... fun to see them purr again.
Athearn Blue Boxes are on that list also, but not all of them. I clean and rebuild them, but some are pretty old, they have the Steel flywheels ... I think I will get those running and sell them.
Since I have done quite a few P2Ks, I will start on some Athearn BB's and some Atlas Yellow Boxes. They are like tanks also.
Lots of Satisfaction giving an old DC loco a new life !!