Firelite MS5024 / US52014 UDE Trouble

Troubleshooting
Press MODE + 8768 + ENTER/STORE
Press A + ENTER/STORE to view AC Input voltage
Press B + ENTER/STORE to display Battery voltage
Press b1 + ENTER/STORE to display voltage on NAC #1
Press b2 + ENTER/STORE to display voltage on NAC #2
Press 1 to 5 + ENTER/STORE views Zone 1 to 5 voltage
Press RESET + ENTER/STORE displays resettable 24 volt power
Normal Zone Voltage with EOL = 23.5 V
Shorted = 0.00 V
Open Circuit = 25.4 V

AC Voltage

MS-5024UD panels MS-5024UDE
Low = 102 VAC     Low = 204 VAC
Normal = 115 VAC Normal = 220 VAC
High = 132 VAC High = 264 VAC

Battery

Normal = 27.6 V
Low Battery = 20.4 V
No Battery = < 17.4 V

Displays
d__1 = Zone 1 Disabled     F__4 = Trouble Zone 4
d__2 = Zone 2 Disabled F__5 = Trouble Zone 5
d__3 = Zone 3 Disabled F__A = Annunciator Fault
d__4 = Zone 4 Disabled F__E = Earth Fault
d__5 = Zone 5 Disabled Lo_b = Low Battery
E__1 = Zone 1 Enabled no_b = No Battery
E__2 = Zone 2 Enabled PH_1 = Primary C. S. Number Comm Fault
E__3 = Zone 3 Enabled PH_2 = Secondary C. S. Number Com Fault
E__4 = Zone 4 Enabled bEL1 = Bell 1 Fault or Disabled
E__5 = Zone 5 Enabled bEL2 = Bell 2 Fault or Disabled
A__1 = Alarm Zone 1 no_1 = Primary Phone Line Fault
A__2 = Alarm Zone 2 no_2 = Secondary Phone Line Fault
A__3 = Alarm Zone 3 SUP1 = Supervisory Alarm Zone 1
A__4 = Alarm Zone 4 SUP2 = Supervisory Alarm Zone 2
A__5 = Alarm Zone 5 SUP3 = Supervisory Alarm Zone 3
F__1 = Trouble Zone 1 SUP4 = Supervisory Alarm Zone 4
F__2 = Trouble Zone 2 SUP5 = Supervisory Alarm Zone 5
F__3 = Trouble Zone 3 _AC_ = AC Power Loss
rES_ = System Reset