Black and white only

[Boing-ball]

If you are looking to get a professional recap and repair done then can highly recommend Ian @ Mutant-caterpillar.co.uk
Well known and respected in the retro community. Plus will do a proper a job and keep you updated..

[Boing-ball]

I first would ask, is it a crystal clear picture on RGB (even though B&W). Seems an odd one for cap leakage, never ever had issue like this. Maybe colour filters.

I think you are right Chris. I remember now that Chris Edwards fixed something similar on a A1200 PAL board on his YouTube channel.