SOURCE: panasonic DVD ls 850 , H03 Code error
I have an LS82 and the following advice from www.avsforum.com fixed the problem for me. Note that the number of screws that hold the bottom on the machine vary depending on the model. Also the server frame might be plastic instead of metal:
Originally Posted by Hossam
fixing code H03is very simple but needs some courrage and small philips screw driver.
the problem arrise from the laser lamb which moves up and down the disk through a mechanical shaft
I do believe when we press the back space for long time it will take the laser lamb beyond its limit and get stuck at the end of the rotating shaft so the servo motor gets difficulty and resistance to get it back to tract
all you have to do is open the back of the LS50 " 12 small screws" 
when you remove the back cover be carful not to damage the cables .
you will find the servo motor and laser lamb on one metal structure hanged to the body by three rubber suspensions
remove the whole structre and turn it upside down slowly
move the small black rotating joints up or down you will notice the the mechanical shaft will start rotating and the laser lamb will start to move away from the servo motor relasing it from where it get stuck
and it will work perfect after that
return the back cover and screw the 12 screws and you are done
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