If for any reason one survey meter is inoperable or considered to be malfunctioning. what should radiographers do?

Radiographers usually work with big sources and that means high gamma dose rates. It is why the first step would be to retract the source into the container, secure it, transfer it to the approved storage area and only then investigate survey meter malfunction.

He should stop all radiographic activities and contact his supervisor to make sure that his SM to be replaced