'99 Intermittent Starting - Bad Ground?

[BratmanXj]

Back story - Last year I had a no-start issue that I THOUGHT was tied to a bad clutch safety switch.  Bike ran fine the 2nd half of last year with a paper-clip jumper in the clutch switch plug.  Over the winter during maintenance I changed out the clutch switch, bike starts fine until I take it off the lift and I have the No-Start condition happening again!  Bike turns on with the key, fuel pump primes when I turn on the kill switch, but I hit the start button and get Oil/Engine light and no starter.  No change for side-stand, clutch pull, or neutral.

Looking over the wiring diagram and if the bike is in Neutral the starter interlock relay should bypass the side-stand & clutch switch.  We pull the interlock relay and start checking with a probe-light and have what look like decent grounds.  Put the relay back in and the bike now starts.  We clean the relay plug real good and everything seems fine now.  The worry in the back of my mind is we didn't ACTUALLY solve the problem and it's gonna crop up while we're out riding somewhere.

I know there is a frame ground in the lower left fairing by the horn... I believe there is one on the right side of the steering head.  Is there any other location I need to check for the starter safety interlock system?