Panasonic KX-FT937LA-B Service Manual page 59

11.1.4. Memory Clear Specification
1
* Execute Service Mode #550 when you want to reset the all setting data keeping the user information.
2
* Execute Service Mode #710 to clear the user information in case that Main Unit is recycled.
Note:
Please restart a power supply after clearing a memory.
59
KX-FT937LA-B