Stukno,

I’m not sure what to make of this, but attached are extracts from AP2062A&C, the Lancaster Parts List dated March 1944, which show on page 47 outline details of the elevators (pre Mod. 1101). On page 46a outline details of Mod. 1101 are shown issued with A/L No.8. This Amendment List was dated 1 May 1946 and I see from your link that the Lancaster crashed on 15 April 1945. The quote from lanc35’s post refers to Mods. 1101 and 1131 (presumably alternatives?). There is no trace of Mod. 1131 in my copy of AP2062A&C, but Mod. 1101 would seem to post-date the crash.

Good luck with your project.

Edit:
Looking at the component parts in more detail, the elevator trimmer appears unchanged: it is the elevator servo that has altered. Somebody with more expertise than me may be able to explain!