Heater box removal

[Walshie]

OK, so some of you may have read my posts and requests in the past regarding water entering the cabin through the bulkhead. I have established that it is not entering because of blocked ducts. Final course of action is to remove the dash board which we have done today with the help of a post showing all the fixings.
I now need to remove the heater box to access the bulkhead from the cabin side. This is where I need help.
Does anybody know where the fixings are for this. Mr Google hasn't helped so far.