Could be a dodgy transducer. Your maintenance guys can look at BHT 407 MM 6, Chapter 63, Page 17 for troubleshooting. Or call Bell Product Support, or your local tech rep.
As for running it without any oil for a full fuel load even you should know that is a load of b*&^cks. You have attended the school.
There is nothing worse than a so called 'experienced individual' who has no idea of what he/she is talking about.