more CARVER 4000T Questions

i was just curious about this piece..

ive been looking online and have found much, i know it was the updated c4000 w/ surround sound.

Does anyone have any more info?

year of manufacture i think was 87?

up/downs?

msrp?

how does it rate compared to to other carver pre-amps?

is it rare?

For what it is worth. Blue Book from the Gon:

Carver 4000t : Used Prices
New $1199.00
$700.00 High
$280.00 Last
$150.00 Low
Used $330.00
Carver 4000t released 1986, a/v console