Wire harness for Worcester 9.24 electronic?

There is an intermittent fault on my boiler; the hot water goes lukewarm. Apparently there is a loose connection in the modureg wire harness, and the problem would be fixed permanently if I replaced the harness. The problem is the part is obsolete, and I've been told that the only solution is to get a new boiler. It seems a real waste as it's a very good boiler with many recently replaced parts, and it's working well apart from that fault. Anybody know if there's another harness that would fit, or another solution?

Patrick
September 2008