Fixng a bowed plastered wall?

Howdy, I am very much a novice to this world of structure improvement/repair. I have recently remodeled my living room and now have a problem with the plaster on one wall.

I had the picture window (52" x 40") removed and replaced with a 5' x 6' picture window. When all was said and done the window was installed off center of the room. Contacting another window installer I had the window removed and centered properly. The space left was repaired very nicely except for one small 14" x 5' section; they didn't do plastering.

I was going to replace the plaster in that area the other day and realized there is a sizable inward bow to the adjoining area. The bow makes about a 1/2" difference in the center of the wall surfaces, tapering to evenly match the top and bottom areas.

:? What is the best way to fix this? Sand down the plaster and then do what? Or just plaster the exposed area to match the bow????

The wall is constructed of lath and sheetrock with plaster on top.

I'd like to complete this before the cold weather sets in here.


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