I couldn't resist buying this NEC PG-9000 (9PG) when I saw it for a giveaway price. The CRTs look mint, and it reports less than 3000 hours on it.
Initially, it had severe vertical distortion, but replacing a bunch of leaking caps on the deflection board fixed that. Now it syncs to the RGB input, but the picture is narrow with keystone distortion, and the width control in the menu has no effect. It won't sync at all on the video input. Even with no signal, it cycles between different scanning modes making the OSD impossible to read most of the time. Surprisingly, connecting composite video to the green input syncs fine, and it had full width last time I checked. This would lead me to believe it's not a problem with the deflection board.
I've found a few more bad caps on the boards inside the shielded box that I will change today. I also need to take a closer look at the more hidden boards for bad caps. Even if that fixes it, a copy of the service manual would be handy. Does anyone have a PDF they would be willing to share?