Okay, now I have finally had chance to strip down my Centris, and here is a list of Electrolytic Caps for the PSU. All the other caps on the Centris PCBs are tantalum or ceramic, and hopefully don't need replacement. All of these electrolytics are standard radial caps, although I've not been able to get radial versions of the big tank capacitors (yet). Some of the component numbers on the PCB are hidden by nasty white glue paste, so I have labelled the component as being NR (near) one that is clearly numbered.

Board SMP-120 EP

C1/C2: 470 uF 200 V radial (not easy to get hold of, but I think snap-in versions do fit)

C807: 470 uF 35 V

Board SMP-120 EP-1

C103: 2200 uF 10 V

C551: 1000 uF 35 V

C252: 470 uF 25 V

NR C105/ C155/ C253: 1000 uF 16 V

NR D255: 470 uF 16V

C302 + a close neighbour/ C612/ C684: 10 uF 50 V

C505: 2.2 uF 50 V

Hopefully someone will find this useful!