Retaining Walls

I have a patio with stone retaining walls. The guys who did it frankly were not very good. I need someone with "stone" installation and maintenance experience to: - replace a few stones - fix the grouting in places - possibly seal the stone as top layer is cracking off This is not a large job. I think someone with experience could make all these small repairs in an hour or two, but you'd have to judge for yourself. -Tim