It looks like my main development machine (an Apple G5 2.5 GHz DP with 4 Gb of RAM) has a coolant leak 🙁
NOOOOOOOOOOOOOOOO!
I’ve taken it in to a service center, but of course the machine is no longer covered by AppleCare 🙁
Apparently this is a fairly common fault on the liquid cooled Macs. And to top it off the coolant is corrosive.