You shouldn't need a manual for a no-click problem. Follow the AC into
the chassis and you'll find a standby transformer either on the board
of mounted to the floor of the cabinet. You can also work back by
following the coil side of the relay back to it's DC source. Either
way you'll check the transormer, rectifiers and filters that provide
the 12 or 24 volts to the relay. Open primaries are not uncommon on
these.

John