Water logged??

Hi Guys..... hope some of you can help... got a disco 52 plate series 2 and have got the double sunroof model.... with internal swimming pool.... I have adopted the vehicle from my father in law and have slowly cured various niggles.... xyz switch.... listing air suspension (sometimes).....
The sunroofs i have at the moment mastic over and the water ingress has stopped(till i can afford and time to .... strip out and renew the headlining)....
My problem is when i get into the car after heavy rain, the dashboard is lit up like a Christmas tree with various lights all over....are there water sensitive components floor level anywhere.... someone mentioned slabsecu?
It seems to cure after a dry spell?
Cant see any water around internal fusebox...its dry....
Thanks for any help
Col

There are a number of ECU's at just above floor level in the Disco 2 behind the passenger's glove box. You'll find, amongst others the SLABS and the BCU.
The fuse board under the steering wheel has the IDM built into the back of it and that unit can be prone to water damage even if the fuse board itself looks OK.

Thanks Brian for replying.....will have to have a look at the weekend see if there's any water present cheers bud