[Arran]

Ed;
  I looked up your 110K2 in the 1937-42 U.S RCA red book and I was mistaken, unlike the Canadian RCA models for those years there is no wiring diagram or parts placement diagram. This would be one of the few occasions where the Philco manuals from the era are actually better. What you have out of Riders and Beitmans is pretty much what's in RCA's red book, so unless RCA sold a stand alone service folder for this set this is pretty much all that you are going to find.
Regards
Arran