Panasonic TX32PB50

Just to let you all know my one week old pb50 which went away for repair due to the buzzing fault during dark or blank images has come back sounding no different what so ever

This is even after the repairer said they had carried out a "MOD"

I'm now waiting for a replacement from ED

If this turns out to be no different I will go for another make

Is there anybody who has had the same problem with this set and has had the problem resolved ,if so how ?