I have seen many theories about the display. Since I have not opened it up I cannot say for sure, but it definitely acts like the polymeric (rubber) connectors (conductive rubber connectors commonly used on LCD displays) are not getting good contact all the time. (press on the bezel or glass and it will make the problem come and go). These are sandwiched between the PCB and the LCD. Could be a little tricky to fix which is why I have left mine alone. I don't know of anyone who has actually taken one apart to fix it. My tapping trick works pretty well for me so for me that is that. As for the relay, you can remove the whole carpet piece from the trunk. This is also handy for cleaning. Just grab it and pull it out. Then you will see this lone relay over on the passenger side behind the rear seat. That is the one that needs its pins resoldered. You will have to find your local McGiver if you don't know how to solder (or just buy a new one).

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra