Hi, and thanks for giving me the opportunity to answer your question.
This is obviously a tough one. You might try *1274# XXXXX seems to be the preset for a similar model.
I hope that this has answered your question. Please let me know if there is anything else that I can do to help.
Good luck, and best regards,
(I would very much appreciate your clicking on the green 'Accept' button, as it is the ONLY way that I get compensated for my time. Thanks VERY much!)