Kevin,
As Dan said, We need to drop the 19's drivers and work on the driving boxes, also the buffer plate needs attention, The check valve issues are resolved. All the rod bushings will get attention as will the cylinders. The Heisler needs to have the front truck dismantled and gone thru. as well as new head gaskets and piston rings, which requires removing the steam chests from the locomotive.
I hope this answers your questions.
Jerry