I just bought a 93 sc400 and the transmission selection background lighting is out near the shifter. The letters P,N,D... do not light up. I took a look at the board screwed to it and noticed there were two lights with blue caps on them. They have philips screw heads on the plastic housing for the lights. What are the sizes of these bulbs. (3mm, 4mm, or 5mm) Thanx in advance for any help.