SUPER 80 FLC GETS ENG LIGHT ACTIVATION AND DIVERTS TO RDU. MAINT FEELS PLACARD WILL BE SUFFICIENT UNTIL FLT IS COMPLETED. CAPT AGREES AND FLT CONTINUES ONLY TO HAVE THE LIGHT ACTIVATE AGAIN. FLT ATTENDANT RPT STATES BELIEF THAT ACFT SHOULD NOT HAVE BEEN RELEASED FROM RDU.

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DURING THE FLT THE COCKPIT NOTIFIED THE #1 FLT ATTENDANT THAT WE HAD A LIGHT INDICATING THE L ENG WAS MALFUNCTIONING. THEY TURNED THE ENG OFF. WE DIVERTED TO RDU. MECHS LOOKED AT IT. THE DECISION WAS MADE TO PLACARD THE LIGHT. ON PUSHBACK FROM RDU; THERE WAS ANOTHER MECHANICAL THAT HAD TO BE CHKED OUT. FINALLY; WE CONTINUED TO PHL. DURING THE FLT; THE COCKPIT TOLD THE FLT ATTENDANTS THAT THEY WERE GOING TO TURN OFF THE L ENG AGAIN BECAUSE THE LIGHT WAS COMING BACK ON. THE PLANE SHOULD HAVE BEEN TAKEN OTS IN RDU. I DON'T THINK SOMETHING SO SERIOUS SHOULD HAVE BEEN PLACARDED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT THERE WAS A DISCUSSION BTWN OTHER FLT ATTENDANTS AND THEY ALL FELT THAT THE ACFT SHOULD HAVE BEEN GNDED IN RDU. NO FOLLOW-UP WAS ATTEMPTED BY RPTR WITH FLC. SHE WAS PRESENT WHEN THE MECH IN RDU STATED IT WAS UP TO THE CAPT IF HE WANTED ACFT PLACARDED OR GNDED. AFTER SOME HESITATION; HE ELECTED TO CONTINUE WITH PLACARD; NOT EXPECTING ANY FURTHER PROBS.