What was found
DURING FLIGHT #2920, BITE LIGHT ILLUMINATED, ALONG WITH INTERMITTENT LEFT AND RIGHT ENGINE FIRE LIGHTS ON CWP. NO CHIMES ASSOCIATED W/ ENGINE FIRE LIGHTS. ALL ENGINE INDICATION NORMAL. AIR RETURN TO MEM. MAINTENANCE REPLACED WEU PN 005WS00, SN/OFF 1463, SN/ON 1004, PERFORMED ADJUSTMENT TEST-CHECK GOOD. NO DEFECTS NOTED. REF AMM 31-50-05-4. A/C OK FOR CONTINUED SERVICE.