The car is a 1995 P38a 4.6 HSE Range Rover which has installed, a 'Glare Control' internal dipping mirror. Today, a liquid bubble has appeared what can only be described as trapped between two layers of glass. Has a leak happened within the unit to cause this 'bubble'? I guess a new mirror is called for.
That sounds like the symptoms of an LCD screen that's cracked, it sounds like they use the LCD screen in front of the mirror glass to darken it when it senses light from behind.
If so, the LCD won't be repairable itself, I suppose you could have it replaced with a new LCD screen but I'll bet that's more expensive than the mirror itself!
My advice would be to change it quickly before you get this black stuff everywhere. Richard at Beamends quoted me about £120 for a new one but I couldn't run to that so I got a manual dipping mirror from him instead.
TonyB
There is a Land Rover electric mirror on eBay ATM still got 6 days to run:
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