Two important doctrine that the WTS replaces with Jesus with itself are;
Trying to indicate Peter said to Jesus "where would we go?" rather than "whom would we go to" as stated in the scripture.
w75 9/1 p. 531 “ Where could we turn if we would leave God’s organization today? There is nowhere else! (John 6:66-69)”
The second and even worse is that they say Jesus is not the mediator of any but the 144000, so everyone needs to be
Worldwide Security Under the "Prince of Peace" (1986) pp.10-11 ch.1
He is the Mediator between his heavenly Father, Jehovah God, and the nation of spiritual .
Watchtower 1979 November 15 p.24
To keep in relationship with “our Savior, God,” the “great crowd” needs to remain united with the remnant of spiritual Israelites.”
Any other examples that you can think of?