What was found
AIRCRAFT NOT GROUNDED: PILOT REPORTS CPDLC FAILED BOTH DISPLAYS TURNED ORANGE, ATC WAS NOT RECEIVING INFORMATION FROM A/C, ACTIVE ATC:CZQX CTL , ADS-C CONNECTED 1, COM NOT AVAIL. MAINTENANCE PERFORMED ATIMS TEST IAW TSM 46-21-00. TEST OK COULD NOT DUPLICATE ATC FAULTS ON GROUND.