This morning M1CEM, M0RLE, M6AOS & M0NFI reinstated the antenna to full height. Reports are very good so far and we expect the repeater to operate as it was before. Many thanks to all those who helped. Neil M0NFI
The problem was traced to water in the coax, it entered at the antenna connection. The antenna has tested out ok so we have refitted it at a reduced height on a temporary coax. New coax will be ordered and installed when time and weather permits. The repeater is back on air with a reduced antenna height so we expect a reduced coverage area.