- Model SXL-EX has visible LED annunciation by zone for alarm and trouble prompts. Additionally, there is a system alarm light-emitting diode (LED) and a system trouble LED. Supervisory zones utilize the zone trouble LED flashing in sync with a system supervisory LED to indicate an abnormal system event. LEDs for AC power bypass and test / program mode are flashing. Then it all clears except for the Test/Program LED still flashes for a few seconds then it glitches out again as described above. I tried exiting program/ test mode but nothing happens this all happened after installing new CPU. Any suggestion on how to reset this error??? Thanks in advance!!!
Don’t have an answer, but I have moved your topic to “Fire Alarm Help” as “the suggestion box” is really designed for suggestions about this website… 
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Thank you!! i appreciate it
The only enthusiast I know who has an SXL-EX is kcin556. I guess you could try him; he might know what the problem is.
You can try reading through the manual which can be found here:
Page 6 describes how the LEDs work.