In MRI.ICR the audit.trail segment (mri.icr.audit.trail in MAGIC) will store an audit trail on each record and what edits were done. The audit.act field stores what type of edit was made on the record. Below is a listing of the possible audit.act values and a description of each:

"EN" -  "ENTER INC RECORD"
"ED" -  "EDIT INC RECORD"
"CP" - "COMPLETE INC RECORD"
"DL" - "DELETE INC RECORD"
"ADDR" - "ADD DOCTOR"
"EDPR" - "EDIT INC PORTION"                                                                                                                                                                                              "EDDR" - "EDIT DOCTOR"
"DLDR" - "DELETE DOCTOR"
"ADRS" - "ADD REASON"
"EDRS" - "EDIT REASON"
"DLRS" - "DELETE REASON"
"ADCM" - "ADD COMMENT"
"EDCM" - "EDIT COMMENT"
"DLCM" - "DELETE COMMENT"
"ADCD" - "ADD CREDIT DAYS"
"DLCD" - "DELETE CREDIT DAYS"