I think the answer to this depends on how your LE options are set. If LE is passing the abend to DC you should get the offset right in the program check message:
IDMS DC027001 V20 T72565 D003 PROGRAM CHECK IN FADDI112 AT OFFSET 31AE
PSW WAS 078D1000 9426B7AE DUMP OF TASK FOLLOWS
If LE is handling the abend I'm sure exactly what messages are produced, there may be even more that one option depending on exactly what you have specified. To get the normal DC handling I used the following:
ABTERMENC=(RETCODE), 07/30/10
TRAP=(OFF,NOSPIE) 02/11/10
Initially I was OK with just overriding the setting for TRAP, but later that year an OS change made in necessary to add the ABTRMENC option also. I've been running this way since. I think you will have to consult the LE manuals for more information if that is the type of output you are getting. I'm not aware of offset being put into a register, but perhaps some forms of LE error handling do that.
Good luck,
John