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You have two issues. First you need the address that open coil. Check if it is open or broken inside at the terminals or anywhere not covered by windings. If you can reach the break you should be able to fix it...Otherwise it is part huntin' time.
If the coil don't fix your fine tuning issue then you will need to align the audio IF stages AND ONLY THE AUDIO IF. The tuner can NOT fix audio and pix not fine tuning at the same point. When the two don't line up one has drifted. Unless picture is really bad (at best), you should tune the sound to match up on the fine tuning.
The easiest procedure to line up the sound on the fine tuning is to fine tune for best pix, then best sound, then move back towards best picture till audio gets fainter (but still remains) then peak the audio IF system. You may need to repeat this a few times to 'walk' the IF into fine tune match with the pix.
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