Best to get the chassis ## off the back, model dont help.
Symptom of "dead set" up till the early 80's was a gravy job,
afterwards it became increasingly bad news the newer you got.
Have to deal with complex switching supplies & bad flybacks.
Not sure what you wish on your upscale set but many very nice
modern style sets were made through the mid 80's that are
much easier to deal with. If you dont need MTS or a big jack pack
there is a lot to choose from.
73 Zeno