There is no pressure fitting to clean. The ribbon is bonded directly to the lcd. That idea fits with what I have seen with mine. I have noticed the number of dead lines seems to change with temperature. Whether that being room temperature or the radio being left on to warm up itself. Mine I could not tell what mode the radio was set to when I started this post. Now it has been on for a bit I am down to 18 dead lines and can guess at the mode and frequency is easy enough to read. There have been days I have not known the mode or the kHz digit in the frequency.