one Lifepower4 battery alarm LED blinking, will not reset

Posted by: @dtbaker61

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Q: is there a way to tell what alarm triggered (without comm cables since I am open loop)

If you have Lifepower4-V1 you can use BMS TEST, if you are using Lifepower4-V2 you can use BMS TOOLS to check what is causing the alarms. 

Q: is there a way to force alarm to clear and reboot?

No, there isn't. 

Q: is it possible that internal BMS failed on one and not others making this a false alarm?

It is possible for one battery to have a problem and not the rest.  

Q: if the BMS failed, is it covered by warranty? and how would I initiate a return/repair, or is there something I can check myself?

It depends on the specific issue. However, the best first step is to troubleshoot the problem before considering a replacement. It might be something minor, such as unbalanced battery cells. If the problem is with the battery itself and not caused by user error, it is typically covered under warranty unless the issue falls within the Warranty Exclusions as shown in the image below.