What was found
PATIENT ON BOARD, COMM 1 & COMM 2 FAIL SIMULTANEOUSLY. PILOT COMMUNICATES WITH TOWER VIA HOSPITAL FREQ ON TDFM & RECEIVES TRANSPONDER SQUAWK & APPROACH INSTRUCTIONS. AFTER SHUTDOWN, POWER IS REAPPLIED. COMM 1 REMAINS INOPERATIVE, COMM 2 IS OPERATIONAL. DEFERRED THE DISCREPANCY & RETURNED TO BASE. DURING MX ACTION THE FOLLOWING MORNING, BOTH COMM 1 & COMM 2 WERE OPERATIONAL WITH NO FAILURES SINCE. PRIOR TO THIS EVENT, COMM 1 HAD FAILED TWICE OVER THE COURSE OF APPROXIMATELY 2 MONTHS. EACH FAILURE WAS BRIEF & CORRECTED ITSELF. THE FAILURES WERE INDICATED BY A RED X THROUGH THE FREQUENCY WINDOWS ON THE MFD & PFD AS WELL AS A RED X IN THE SYS STATUS PAGE ON THE MFD.