Apple Time Capsule Model A1302 Hard Drive Replacement
Constant yellow light doesn’t mean once and for all that the HDD is faulty. In my case it showed that the electronic was not alright. When I put out the HDD both worked fine - the AirPort of TimeCapsule and the HDD in an external dock. The guide is excellent, but be very careful trying to put out the plug of the fan, as this seems to be the predetermined breaking point.