Hi,
I think you will find to access the service mode you will need to hold down volume down button on the set and at the same time press 0 button on remote three times within 2 secs - but be careful you shouldnt really need to go in there. I have never needed to adjust anything in the service mode before.
I think BC109 is refering to re-initialization of the set - you hold down volume down on set and then press I on the remote, you will then see "self check" appear on the sceen, switch the set off at the mains switch and back on again, and you will find it will start up like when you first unboxed it