So what did you find was the problem? Sounds to be running nicely.
The User Handbook won't give details of POLs etc this info is contained in the Servicing Schedule Army Code No.13068
The reason being that lubricants may become superseded as the result of improvements, changing role, obsolescence etc So a small pamphlet can be changed without too much difficulty, demonstrated by the fact that in more recent years the SS has been amended & revised in 1973, 1974, 1976, 1977, 1990
I have the latest version somewhere.