Panasonic KX-T336 System Reference Manual page 1452

72xx MN Digital trunk failure
75xx MN Digital trunk failure
80xx MN DTMF generator failure
9rxx MN DTMF receiver failure
Ayxx MN Tone detector failure
Byxx MN HDLC failure
Cyxx -- Port link failure
D000 MN OHCA SW failure
Dyxx -- OHCA not installed
FFFF MN TSW DTMF G./R. failure
Legend:
MJ-Major Alarm
MN-Minor Alarm
D-Trunk Failure
D-TRK
D-Trunk Failure
D-TRK
DTMF G. Failure
DTMF G.
DTMF R. Failure DTMF R.
Tone Detector
TN DTCT
HDLC Failure HDLC
OHCA sw Failure OHCA SW
TSW Failure TSW FLT
14-E-4-1
(70695)
line trouble
(AIS signal reception)
line trouble
(frame trouble)