Panasonic KX-T336 System Reference Manual page 1475

3.21 LPR memory checksum error
Error Code
Possible cause of
the malfunction
Countermeasures
Note
20xx.
xx= 01 to 42 : Slot number
1) Defective LPR RAM
Check the status of the related card
Faulty
Enter INS command from the
maintenance terminal
Check the status of the card
Faulty
None
Replace the LPR card
End
14-E-24
INS
INS