Panasonic DMP-BD81PU Service Manual page 26

Mode name
Laser Used Time Check laser used time (hours) of drive.
Indication
Item
Description
TV display
(****) is the used time display in
hour. Laser used time of BD/DVD/
CD in Playback mode is counted.
26
Key operation
(Remote controller key)
Press [4] [1] in service mode.