AE500 "LAMP OK" in red not green

I have a Panasonic AE500 and under the "SELF CHECK" menu "LAMP OK" appears in red rather than green as normal. Does anyone know what this means? TEMP1 is at 80 and TEMP2 is at 169. both these are green along with everything else. Its my third lamp and its only been running for 122 "real" hours, mostly on low.

I can't see the indicator lights on top of the PJ because its blu-tac'd to a surface and its a pain to line up with the screen.