As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 3681 ICE PROTECTION LOOK-UP LIGHT ILLUMINATED ON CWP WITH NO OVERHEAD INDICATION. CREW WAS HEADING INTO WEATHER. AIR TURNBACK TO MEM. MAINTENANCE REPLACED PCB WQ7 P/N 46546-524-0, S/N ON 3211, S/N OFF 3204, REPLACED WQ1 P/N 46546-514, S/N ON 3739, S/N OFF 3566. TESTED OPS CHECK GOOD.