My Apple Airport Express failed today with a continuous green pulsing light.
You can find all kinds of information on the net about various power supply failure issues with these but nothing specific to my problem.
To break apart I placed a stanley blade into the seam that separates the two halves and hit firmly with a hammer, working my way all around the seam.
Once apart I checked the power supplies as described in various other places around the net namely the 5V & 3,3V. The 3.3V was okay off load but as soon as the airport module was connected this dropped to 2.2V.
First I replaced the 100uF electrolytic on the 3,3V output (first pic), it didn't solve the problem and the electrolytic I removed checked fine.
I then replaced another two 100uFs, C104 & C105 (second pic) they measured very high ESR and this solved the problem.
I fitted 85 deg components as these were all I had but rest assured I will find something more suitable before putting it all back together.