As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACARS DATALINK IS FULL AND IT IS VERY SLOW IN ITS COMMUNICATION FUNCTIONS. ACFT GROUNDED. PERFORMED FIM TASK 34-61-00-810-839. RESET DATA LINK. DATA FULL MESSAGE DO NOT SHOW ON EITHER DIPLAY AFTER 5 MIN INITIAL DISCREPANCY INTERMITTENT FAULT IAW FIM TASK.