Hello Marco,
I own a 1985 Gibson Chet Atkins CEC (Black), for some unknown reason the third (G) string pick up does not function anymore, I remember the guitar falling off a stand without any physical damage but this was the probable cause.
I believe something happened to the preamp and you may have an answer to my problem, I would much appreciate if you could share your knowledge.
I thank you in advance.
Jaime