Just released has some more output:-
[TiVo [p0] ~]# grep TCD_ID /var/log/svclog
ird_id TCD_ID=0020000202688B4 CALL_ID=1128090611 TIME=1128090633 ID=532688B4
tcd_driveid TCD_ID=0020000202688B4 CALL_ID=1128090611 TIME=1128090633 HDA=4JS0MXP8 HDB=Unknown
tclient_hangup TCD_ID=0020000202688B4 CALL_ID=1128090611 TIME=1128090812 CODE=65535
tclient_result TCD_ID=0020000202688B4 CALL_ID=1128090611 TIME=1128090812 STATUS=Failed CODE=14