I had the same issue with -7 blades (the latest aluminum leading edge blades) with 390 hr. T.T. I sent them back to the factory for inspection, one blade was considered un-airworthy and the other required refinishing with the latest primer and top coat. The one that was condemned had a small blister about one half the size of a pencil eraser on the leading edge out next to the tip cap. California will not allow zinc chromate primer to be sprayed from a paint gun. I'm sure Robinson was using a water base primer just like all the auto paint shops in CA. The latest fix is, CA has allowed Robinson to apply zinc chromate via rolling it on. With the hundreds, possibly thousands of blades being sent back to the factory plus the production line requirements blades are not available for a long time.
My first invoice as was $26,000. After a phone call to Robinson they said, well how about $12,000.
Then after two emails to Kurt Robinson I am getting two new blades for $9,000 someday. New blades sell for $19,900 each.