I noticed a bow in the LCD board while installing LCD screens. Occurs when fasteners are tightened.
I took a look at an LCD assembly and the CLCD PCB assembly. The pins of the speaker on the CLCD board are slightly longer than the height of the standoffs, causing the board to bow when installed on the plastic LCD Back piece. A possible fix would be to add an indentation on the LCD Back at the point where the CLCD board speaker pins are located. Another possible fix would be to lengthen the standoffs on the LCD Back by 1mm to accommodate the length of the speaker pins.
Never mind. I was looking at an older LCD assembly. The standoff length on the newer LCD Back piece now accommodates the long speaker pins. The bowing on the new assemblies is very minimal but may be caused by either the LCD Back plastic piece bowing when installed or the brass M3 inserts not being exactly perpendicular. As long as the bowing is minimal, it should not cause any problems. If, however, the bowing is excessive, the plastic parts of the LCD assembly should be examined and replaced, if needed.