Service/remove heater unit

[T100SS]

Below is a link to a useful vid.
Mine also had right angle brakets bolted to the bulkhead.

I relined with imitation chamois instead of foam

gentle tap pressure (hose pipe) cleared the matrix - the box is held with self tapping screws. Wiring can be nightmarish as can be plumbing - what goes whre is often the reverse of what you think. The plastic end covers connect to the pipes going through the parcel shelf, for example
http://youtu.be/v75LjUrVaPE