Overthewing - post 802
Passenger evidence suggests the pilot saw a warning light displayed, but wasn't sure what it meant.
I'm sorry but if the fare paying public actually thinks any Pilot doesn't really understand what a warning light means - we have a problem. What the light means is usually obvious - what is causing the underlying problem is often not. That's why, as a precaution, the crew return to have things checked out. Often, the underlying causes are minor and irrelevant. Sometimes the warning requires more attention.
I have yet to see an A/c Commander agree to proceed with a flight if there is any doubt about servicability nor and engineer sign off a tech sheet without being staisfied that the fault has been cleared or that he is totally satisfied that there is nothing to concern the safety of the flight.