Hi - We have a retaining wall on our property that is about 8ft high and 15ft wide. It appears to be constructed of fairly thick (1 1/2 ft or so) concrete surfaced with cultured stone. I can't seem to see any drainage at all with this wall. There are no weep holes or french drains that I can see. They wall seems fine and is not cracked or leaning. My question is what should I do about this to figure out proper drainage. To add to the problem, the wall makes a 90 degree turn back up into the hill (i assume so it won't fall over), so I can't just dig down and put a proper drain behind it. Does anyone have any advice?

Thanks