I'm experiencing some Water Issues on the rear end of my car. It's a 87 300TD. I was Changing out some things today and I noticed the Spare well had water in it... this is not the first occurrence of this. I've replaced a Cracked lens which retained a Surprising amount of water.. Could This be related or has my weather stripping worn out?

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hum.....
1987 300TD 311,000M Stolen. Presumed destroyed