Looks like it needs a careful fret dress.
Next time after that you'll want to consider a refret
This guy seems good - not too far from Brum if you drive
http://www.leicestershire-luthier.co.uk/
Hi. Took my guitar to this guy just before Christmas and picked it up yesterday. Certainly very enthusiastic and knows his stuff. He talks in millimeters, and tenths thereof. Very precise. It had a fret dress, slip-stone nut, a new Gotoh bridge, as the original has sagged slightly, service and set-up. Not bad for £100.
The guitar feels fantastic. (And my wife commented several times on its shine. Ahem.) All the buzz has gone, the sustain's extended, and I'm not sure what's gone on with the bridge pickup but it sounds far better than it did before. I suspect he may have lowered the pickups a little.
The frets are schmoooove. The action's a little lower than it was, and although I don't like a too-low action, it works fine for me. Other than that there's just a general change in how it feels. Maybe it's just that bit more inspiring.
He was very complimentary about it, too. One of the better 335s he's come across - which surprised me as I thought 79 wasn't one of the best years. He said it feels as good as a 72 he's had, only sounds better, and also comparible to a 60-something. Far better than the new one he has in.
Certainly a recommendation from me to go to this guy if you're in the area. Obviously takes great pride in his work. I feel like my guitar's had a fornight in a health spar, where it's been massaged and soothed and spent time in the Jacuzzi!
Thanks for the tip!