I dismanteled the LCD panel and could check the LED stribes. These are edge stribes with the number for L/H G1LE-400SMC-R6 and for R/H G1LE-400SMD-R6. Unfortunately they are NOT defect.
@jvezina: I couldn’t find any sticker. But I have to say that I didn’t remove the last layer. Nonetheless I could remove the two stribes.