Doesn't the wiring loom travel down the A pillar and then along the heater channel flange to the rear/ It does on our RHD 1303. It may be that the welder moved the lom out of the sill area but melted the wiring in the door post. Its worth a check. I bet he would have ensured that the horizontal part of the loom was far enough away from any heat - wouldn't he?
Clive
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