had my 15 month thompson box changed last week and the engineer was brilliant, even said the picture on HD cricket on my kuro was the best hd picture he had seen having never seen a pioneer before. he changed my box to a refurb amstrad and all was well. even got the old epg back, but its started making a high pitched sound when on and itsdriving me mad. even my girlfriend can here it. do i call sky and ask for another, or am i stuck with it?