As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HF 1 FAILED RO COUPLE ATB WITH HF2 PREVIOUSLY MEL'D. FOLLOWING ATB AND HF1 TROUBLESHOOTING, HF1 ONCE AGAIN FAILED TO COUPLE ON GROUND. GROUNDED - YES. RE-RACKED HF1-PERFORMED BITE TEST AND OPS TES-GOOD PER 23-11-00. NO FAULTS NOTED. OK FOR SERVICE. REPLACED HF1 COUPLER (3RE1) PER AMM 23-11-36-400-801-A. OPS CHECK GOOD. AC OK TO CONTINUE SERVICE.