As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CARGO FIRE LIGHT TESTING INTERMITTENT. GROUNDED - YES. CARGO FIRE TEST FWD & AFT A AND B LOOP FAIL INTERMITTANTLY. REMOVED AND REPLACED CARGO FIRE CONTROL MODULE PER B737-800 AMM 20-00-02, FWD SMK DET A2 & AFT SMK DET B3 PER AMM 26-16-01. ALL CKS NML PER SAME. GND VERIFICATION SUCCESSFUL.