Hello Colin,
I normally am on one of the other TC forums 'Time Capsule dead?' and have just dipped into this one. I see you have followed the very wise route favoured by Ray Haverfield, done the fan mod and THEN have your capacitors die. Sadly, this was a bit predictable. The cooling would have extended their working life by a few weeks, possibly months but the damage had already been done. Gradually as the capacitors cook, their ESR will rise to 'an Ohm or two' and then they are on the road of no recovery. They will fail, time will tell; sadly as it did for you.
If the new capacitors you have put in are good make, high temperature units and the fan +has been made to blow through the PSU+, you should never have trouble again.
Messing around with the fan; turning it over, covering the inside opening with tape, shortening the rubber legs, making it run at half-speed, blah blah... is a real pain BUT it does make the PSU, as seen from outside the case top, run some 10 degrees C cooler. Rule of thumb suggests a doubling of the capacitor life. I think FROM NEW running cool, it will be over 5 years. The only possible irritant is the susurration of the fan. To be honest I think that is a small price to pay.
If you have not either cut the side of the fan open, towards the PSU OR turned it over so it will naturally blow through the PSU, do so now and your TC will have a long and happy life. 🙂
Only when we see the LATEST version of TC from Apple with a nod towards the PSU cooling, will we know it has received some real regard to its longevity. No air input? No change in design - the PSU will fail - it runs too hot for a long life and this is a FACT.
Well done, BTW, for having the heart to carve up your TC to fix it.
Regards,
Chris Fackrell
YORK,
UK.