Heater matrix removal

Hi guys,

Have been all day trying to remove the heater assembly, so i can change my heater matrix. To the best of my knowledge all bolts are removed, so it should just pull out.

However at the passenger side it still feels very tight and its not budging. The other side feels quite free.

I've removed to 10mm nuts on the bulkhead from the engine bay. Removed the 2 water bipes going to the bulkhead and the Air con pipes/block at the bulkhead.

I cant seem to see anything else that needs taken out.

Its a 2000 octavia 1.6 petrol

Can anyone help???