Outer Casing Seemingly Bulging

Bought my 5000T three weeks ago and have already reported that it is running very hot. Now I am aware of a slight bulge appearing on the top casing on the right hand side of the unit.
Can anyone tell me if they have any experience of an overheating unit or noticed if the top casing is bulging.
Does anyone experience a moire effect when switching channels, concentric circles radiating out from the top right of the screen.