E-TEC 90 "No Oil" faults

[GrimesinMA]

I have a model E90DPLSOR that frequently gives me a "No Oil" warning which puts it into limp-home mode. Shutting the motor off and re-starting clears the problem. On any given outing this may happen ten or more times so it is more than just a small nuisance. I have verified that there is oil in the tank but upon inspection I also see little air bubbles in the lines. I suspect that these are causing the faults but they might be normal. What should I do to fix this problem?

Pic:

[boats.net]

Air in oil lines are not normal, need to check oil supply lines to oil pump and check oil pump to see where air is coming from.