I have the service manual for your machine, but not the parts book (not a big deal). The 955 serial prefixes are amazing--I have two parts books, one is for 85J (which covers my machine) and the other is 60A and 42D (which is the 955A bulldozer). I have two operation and maintenance manuals--again, 85J for mine and one for 60A, 72A, 77A, and 92A!. And two service manuals--one for my machine and the other is for 61H, 53H, 48H, and 31J. What I find even more perplexing is that for all of the different prefixes the 955K series uses, Cat continued to use 85J for 955L machines!
Anyhow, I'll take a gander at the book and see if anything jumps out. Not likely, though.