What was found
(CAN) DIVERTED DUE TO DURING CLIMB THROUGH APPROXIMATELY FL300 CREW NOTICED A STRONG ODOR OF BURNING PLASTIC IN THE FLIGHT DECK. SHORTLY THEREAFTER THE F/A CALLED TO REPORT THE ODOR AS WELL, THE CREW ACTIONED THE SMOKE/FUMES QRC AND DIVERTED. THE STRONG FUMES LASTED AT LEAST 5 MINUTES. FIM TASK 21-00, TASK 806 CARRIED OUT WITH NO ABNORMALITIES. NO SMELLS, ODORS WERE NOTED. ACFT HIGH POWER RUNS CARRIED OUT IAW AMM 71-00-00 BY THE FLIGHT CREW PERFORMING RUNS UNDER SUPERVISION OF MAINTENANCE WITH NO ODORS NOTED DURING GROUND RUNS OR TAXI.