Cat 140G Moldboard repair ?

How can I repair the bottom of the moldboard previous mechanics and operators have worn thru the cutting edge on what appears to be numerous occasions and have worn the bottom of the blade up into the cutting edge bolt holes in spots.

also on a side note this is an older unit with a 3306 in it with no power wont ever make smoke will stall in 1st gear wot with barely anything in the blade 1760 hrs on unit , had a bad algae problem I think I have that mess cleaned out finally, now I can...

Cat 140G Moldboard repair ?

Cat 140G Moldboard repair ?