Plaster Board metal edging strips

[TJC]

I'm just about to tackle decorating my lounge and on one corner joint the metal edging strip joining the 2 plaster board joints together to form a corner, has bulged out in several places. I want to repair these so I have a nice crisp clean joint before I decorate.

What is the best way of sorting this out, can I bang/dent them back in with hammer or cut out the offending sections and then fill over the top, or is it pull out and replacement the whole strip floor to ceiling and re-plaster.

Many thanks for any advice

Terry