Hi!
Thanks for posting the CDU–10BA241 Circuit Diagram!
That bulged 3μ3 50 V non–polarised electrolytic capacitor is of a type called "high–frequency Bi–Polar", and is much larger than those tiddly small things they use in audio applications, they were specifically made to withstand the very large peak currents in line scan deflection circuits!
In the old days when CRT monitors were repaired these electrolytics were stocked by suppliers that specialised in Monitor Repair Parts, and I don't think they're available new anymore!
However there is an axial type of polypropylene capacitor called Visaton MKT–A, available in the UK from CPC and Impact Audio, as well as eBay, in a good range of values to replace these special non–polarised electrolytic scan coupling capacitors!
Chris Williams