Panasonic KX-TD500 System Reference Manual page 919

Reference
For details about the following commands, refer to:
Section 16-E-3.00 "TST command (Test)
TST
Section 16-F-1.00 "SYM command (System
SYM
Maintenance Monitor)
Section 16-D-1.02 "Error Log"
ERR
Section 16-F-2.00 "TFD command (Traffic
TFD
Display)"
Section 17-B-4.01 "Saving Procedure"
SAV
Section 18-B-2.01 "Saving Procedure"
Section 17-B-4.02 "Loading Procedure"
LOD
Section 18-B-2.02 "Loading Procedure"
Section 9-B-2.02 "Restart"
RST
9-D-5