Dear Kjwj,
Maybe the player laser lens is dusty. You can try cleaning it with a CD/DVD lenses cleaner disc, like the one shown in the link below:
http://www.amazon.com/Memorex-32020029479-DVD-Lens-Cleaning/dp/B00008EM7U
I cannot provide info regarding the service mode codes because no information regarding the DVD player (brand and model) was provided.
Hope you may find this information useful!
Best regards,
Miguel Luiz Martins
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