Confused About Default on File

So I have a default on file. As far as I can tell it is due to drop off.
The details are as follows:

Account started: 6/2/2002
Account Settled:: 31/8/2011

It last appears to have been updated from the lender January this year.

There doesn't seem to be a date that says when it was defaulted. If I go back along the months, it goes back to defaulted at over 66 months ago. It also says

Balance: £105 credit in use. And the previous balance says £105 straight across.

Based on the above, will this drop off at the end of August, even though there doesn't appear to be anything that says when it was defaulted, just "settled"?

And the balance, is that how much I have to pay still? Should I just go ahead and pay that now (though I have no idea how to pay it as I don't have the account details - should I just contact MBNA who the CC was with?) or will that then prolong how long it stays on my credit file for?

Note: I am not trying to get out of paying it, I simply don't want it to continue to impact my file if it's meant to drop off (so I want clarification whether paying it will change that).

Any help is appreciated.