Thank you for picture lot no plating problem.
If we see from picture, there are several part with condition discolour [No Problem] Detail picture attachment.
I’m worry there are difference inspection for this problem in Nichiro.
Please check again whether the lot no right with conditon appearance plating discolored. [Lot No. 17ADI21, 17BDI21,
18ADI21, 18BDI21, 21BDI21, 23ADI21]