Cat 7155 shift tower indicator blinking

[JH1]

There is a blinking light on the shift tower, down by neutral. It is not the light that indicates that the strip heaters are on. I assumed it was low air to the tranny, but I have full air and it's still blinking. What is that light? The blink rate is very consistent, about once a second. Looks intentional, not a bad connection making and breaking. It's not mentioned in the -10 operator manual. I have the latest mods to the M915, including 4 air tanks. Maybe the later mods added this for some reason, like maybe a clogged filter?? Anyone know of an instruction sheet that may have been issued with the MWO for more air tanks? Maybe it's a warning indicator that there is an incoming missile??

Jim