Christian scholars see evidence of tampering, especailly with the word "Spirit":
In the famous "Anchor Bible" we find the following quote: "The word parakletos is peculiar in the NT to the Johnannine literature. In John ii Jesus is a parakletos (not a title), serving as a heavenly intercessor with the Father ... Christian tradition has identified this figure (Paraclete) as the Holy Spirit, but scholars like Spitta, Delafosse, Windisch, Sasse, Bultmann, and Betz have doubted whether this identification is true to the original picture and have suggested that the Paraclete was once an independent salvific figure, later confused with the Holy Spirit." (The Anchor Bible, Doubleday & Company, Inc, Garden City, N.Y. 1970, Volume 29A, p. 1135)
In the famous "Anchor Bible" we find the following quote: "The word parakletos is peculiar in the NT to the Johnannine literature. In John ii Jesus is a parakletos (not a title), serving as a heavenly intercessor with the Father ... Christian tradition has identified this figure (Paraclete) as the Holy Spirit, but scholars like Spitta, Delafosse, Windisch, Sasse, Bultmann, and Betz have doubted whether this identification is true to the original picture and have suggested that the Paraclete was once an independent salvific figure, later confused with the Holy Spirit." (The Anchor Bible, Doubleday & Company, Inc, Garden City, N.Y. 1970, Volume 29A, p. 1135)