If the tuner is out, there is very little, if anything that can be done about it, cause there is nobody around who works on them anymore.
They are very hard to work on as you end up doing more harm than good unless you really know what you are doing.
And as stated before, they have these to find out if it really IS the tuner that is faulty.
https://www.ebay.com/itm/16563422078...Bk9SR_DcmuTsYA