You commented the code that does that out:

if @optype = 2 --or @optype = 3

the or @optype = 3 is what puts in the old (pre-update) values in the update case; the code I suggested gives both the pre-update values and the post-update values, so that you can see both what has been changed and what it has been changed to.

The delete case having a null body was a silly omission in what I suggested. the declaration of body needs to be changed to

DECLARE @Body varchar(500); set @Body = '';

so that it isn't null even if there are no new rows.