What procedure may be used by Volunteer Monitors to localize a station whose continuous carrier is holding a repeater on in their area?
Why A stuck carrier is transmitting on the repeater's input frequency, so monitors listen there, not on the output. Each Volunteer Monitor points a directional antenna at the signal from their own location and notes the bearing; plotting two or more bearings on a map lets the lines cross at the transmitter's location. That is classic triangulation, or radio direction finding, and it is the standard method for tracking down an interfering or stuck station.
Watch out Comparing input and output signal strengths tells you nothing about direction, since the repeater output comes from the repeater site, not the offending station, and polarization comparisons do not give a bearing either.
Find the offender by direction, not by strength: multiple beam headings on the INPUT frequency cross at the culprit.