Those relays above MHC, if my memory serves me, are for doors and gate. About door locks, sometimes those were installed too close(keeper hanging on top part of the contact, instead of touching both), should be easy enough to correct.
Again, keep those relays on RMH board in good shape, you shouldn't have too much of problem. be perfect honest with you, I've never changed those battery yet(sheer dumb luck?)
Good Luck
Iggy
