Replacing C1 fixes one of the major problems with the earliest analog boards, but replacing only that cap won't solve other problems created by other caps that are either weak or dead or leaking. I must admit that I've not yet seen the same amount of "leaking" from the big caps on the analog boards of early Macs, relative to the massive leaking I see on the silver SMD caps on an SE/30 motherboard. But that doesn't mean all the electrolytic caps on the early analog boards are still working at near maximum capacity.

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One of the old aftermarket houses (perhaps more than one) sold a "Larry Pina" kit. They didn't call it that, but it contained all the parts that Larry recommends replacing on the analog board in his book, except the BU406 transistor. This was back around 1993 or 4. The kits were $50 each or $25 each if you purchased five or more. So I bought 5 way back when. I still have a couple left. They're turning out to be worth it just to have the peace of mind that I have a couple of replacement flybacks on hand. Those seem to be unobtainium now.

Makes me regret the upgrades I did to analog boards where I replaced the flyback with the kit's and probably trashed a serviceable, albeit older flyback.