Contact ID text meaning

Hi

I'm having some difficulty in the following terms, from Contact ID:

324 Trouble relay

325 Reversing relay

376 Hold-up zone trouble - Is hold-up about delay or roberry ?

526 Notification appliance chk. #3 - what is "chk." and when is this event used?

377 Swinger trouble

Could you explain the meaning of it ?

Thanks

formatting link

"Participe" a écrit dans le message de groupe de discussion : snipped-for-privacy@l42g2000yqe.googlegroups.com...

Note sure about the other one but this one might mean that you live too close of a swinger club?

you're welcome ;-)