Ex-commercial machine - getting it going (longish)

Hi there

This is my first post here, and first post as owner of a decent
espresso maker: predictably, I'm looking for some help.

I picked up a well-used 2 group Gaggia D90 for a song on
ebay a while ago, and have just got it plumbed in and going.
Haven't been able to find a manual for it online, though the
PDF for the Gaggia Evolution range was close enough for
me to work out the installation and switch-on.

On trying it, I get steam from both steam wands, but I also
get steam from the hot water spout - not much use for tea.

Boiler pressure fluctuates from 1.1 to 1.5 bar: I guess I need
to turn the regulator down a touch, but will this help with
getting hot water out?

One of the wands leaks slightly when turned off - is it
possible to replace the valve seals, or am I looking at a
whole new valve here?

On trying the groupheads (admittedly with some fairly old
preground stuff, as I wasn't expecting to get anything
drinkable my first few times), I'm basically seeing brown
soup.

The PFs both turn too far round to the right (replace the
seals, I guess), and my pump pressure is lousy, only about
2 bar max. I tried turning the regulator screw right in, but
it seemed to have no effect at all on pressure, and just made
the pump squeal in pain.

If anyone's got any bright ideas, I'd welcome them ...

I'd also love a copy of the operations manual (though I can
get by without it at the moment) and ideally a service manual
for the machine - does Gaggia make such a thing available?
I'm in the UK if it make a difference.

Finally, I'm dreading my next electricity bill ... Is it possible
to insulate the boiler in some way to cut heat losses and
make it sensible to leave the thing on?

Sorry to turn up here and ask a whole raft of questions as
my introduction, and thanks both for reading this far and
for any help or advice.

Cheers

John

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