B737-300FLT CREW EXPERIENCES N1 OVERSPD ON CLIMBOUT. RETURNS TO DEP ARPT FOR MAINT.

Narrative

WE WERE CLBING OUT OF ZZZ AND AT ABOUT FL180 WE HAD A YAWING TO THE L WITH HIGH N1 AND WHAT LOOKED LIKE AN OVER-TEMP ON THE #1 ENG. I WAS THE PF AND AT THAT TIME I RETARDED THE THRUST ON #1 ENG AND TURNED OFF THE AUTOPLT. WE CLBED TO FL200 AND TALKED WITH ATC AND TOLD THEM WE HAD A PROB. WE STAYED WITH CTR AND RAN THE ENG OVERHEAT CHKLIST AND THE SURGE CHKLIST. WE THEN CALLED DISPATCH AND MAINT CTL. THEY TOLD ME TO RETURN TO ZZZ. ALL ENG READINGS WERE NORMAL AND WE RETURNED TO ZZZ WITHOUT ANY PROBS. WHEN I GOT TO THE GATE MAINT WAS WAITING FOR US AND WE TALKED ABOUT THE WRITE-UP. ALSO SCHEDULING WAS CALLING AT THE SAME TIME AS DISPATCH. WHEN THE ENG HAD ITS PROB; I WROTE IT UP AS A POSSIBLE OVER-TEMP. I SAW A RED LIGHT; BUT I FAILED TO NOTICE THE EGT; IT WAS THE RED LIGHT FOR THE N1. AS I CONTINUED MY DAY AND TALKING WITH MAINT SUPVRS IT WAS DECIDED THAT WHAT HAPPENED WAS A BAD PMC HAD ALLOWED AN OVERSPD ON ENG #1. THE WRITE-UP WAS CORRECTED TO REFLECT THAT AN OVERSPD HAD OCCURRED AND NOT AN OVER-TEMP.