As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLT THE LT FIRE DETECT FAIL CWP CAUTION LIGHT REPEATEDLY CYCLED ON & OFF. LIGHT WOULD GO OUT FOR 3 SECONDS AND COME BACK ON, QRH COMPLETE. AIR RETURN TO MQT. MAINTENANCE FOUND CONTAMINATED CONNECTOR AT ENGINE NACELLE, CLEANED & SAFTETIED. OPS CHECK GOOD. SEE CONTINUATION CARDS NR 062320 & NR 062319 FOR FURTHER DETAIL.