If, like me, you're one of those unfortunate ICX7150-C12P owners whose power supply has died, take comfort. There are replacement units available. Digikey has at least two: items LB240S56K and GCS350PS56 at the top of the list linked below. These are both 56VDC supplies which will deliver adequate power even after derating for convection cooling. They're the same form factor and use the same connectors as the original Ruckus PSU.
Warning: they both cost over $100!
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The LB240S56K is a 'big brother' of the 130W LB130S56 @fohdeesha
mentioned in a Reddit post on this subject (see below), and which I've purchased on eBay and intend to try out. I'm only running a single PoE device off my switch (an AP) so the lower power rating shouldn't be a problem -- I hope. If it doesn't work out, I'm either going to spring for a new C12P with warranty, or one of the PSUs above. Haven't made up my mind about that yet.