Water leak onto the automatic transmission computer from the passenger side of the windscreen on Jaguar XJ6

Problem Description and Possible Solution
In areas of the country with a high amount of precipitation (or in vehicles with rust on the lower passenger side windscreen), water can leak into the automatic transmission computer. This will illuminate a transmission failure light on the control panel and cause the transmission to shift erratically.
Problem Data
RepairPal Verified
Average mileage: 116,237 (116,237–116,237)
3 model years affected: 1990, 1991, 1992
6 people reported this problem
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Took my car for a car wash and then the transmission light came on and is shifting hard now.