You are correct, I meant Centris, not Quadra.
The first thing I did was pop out the battery, it was a red Maxwell :O (no signs of corrosion thankfully).
Not a collection item for me though, have a practical for it, building a console to run some Virtual World Entertainment 3.0 pods (cockpit simulators that run Battletech and Red Planet).
I do have one question though, at what point should I have the caps replaced on these old Macs? Where there are signs of issues or should I just do it as a preventative measure?