Pay before or after goodwill letter?

Currently @ 612 eq / 648 ex / 620 tu

Want to get above 640 on all, then to 700+ on all.

Haven’t had any deliquency in years – bad credit is coming primarily from two old charge-offs:

CHASE CARD  Charged-off  02/2014 (last reported)

COMCAST   In Collections  02/2015 (last reported)

Here’s the thing… I don’t even know how much I owe on these.

My goal is to get them removed from my accounts.

How should I go about this? Should I attempt to pay off both accounts first and then send goodwill letters? Should I offer payment in full in exchange for record deletion?

Who do I even contact? Is there a good contact for Chase or Comcast (Comcast debt has been sold to SOUTHWEST CREDIT SYS according to Equifax).

Really hoping to get these issues fixed as it was from a very brief time of immature deliquency right after college – I now work really hard and make six figures, but sadly have to deal with getting rejected and/or getting bad rates for credit from a stupid year. I’m sure many of you can relate…