There's an old topic about this (service menu on LX5500) but I can´t find it. I remember A is "hours in use divided with 10". So your TV has been used for 20 550 hours (2,35 years). This of course doesn't include standby mode.

B is hours in use left divided with 10. (40)

Sorry, can't remember B and C.

Thank you Daniel,

Still pin sharp picture!

Found it!

http://forum.beoworld.org/forums/p/19575/146034.aspx#146034

B is hours in link use divided by 10.

Thanks for that Daniel

David