As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH HF1 & HF2 NO SIDE TONE - CANNOT TRANSMIT - CAN RECEIVE ON HF1 & HF2 BUT NO SELCAL AVAILABLE. GROUNDED - YES. POWERED AIRCRAFT DOWN AND POWERED AIRCRAFT UP. PERFORMED B737-800 FIM TASK 23-11 TAK 806. OPS TEST NORMAL. SEAMC JEFF NOTIFIED.