mate contact NEC. The number is 08701 201160 you'll speak to a very helful lady called sarah who is watching (wave). At the moment NEC are investigating this problem in Japan with the manufacturers. I dont think theres any poin tin getting a replacement at the moment because i'm not sure if NEC know how widespread the problem is.
I have been advised to just leave all my contact details, use th emonitor as i need to and they will be in touch when a decision is made.
OCUK will also RMA it but tbh NEC are going to replace these things and its normally a drop off and return policy.
H