SRN- is at 10V instead of 0V

[TheMax74]

Hi,
Last night my siren has started to sound without any alarm.
Today i disconnected the siren and found that betwteen SRN+ and SRN- there is 10V.
Between SRN+ and COM there is 13.4V.
The checkbox \"Reverse siren\" is set to \"Yes\"

I have then set it to \"No\" and i\'ve measured again 10V.
I suspect a faulty board.
Is there something i can fix by myself?
Thanks.

[ident]

Try connecting a 1K resistor between SRN+ and SRN- in case there is soime leakage current