Been a while since I've owned a TRX but if I recall you can't delete a scan list per-se but rather empty (or delete) the objects contained within. Pages 41 & 42 of the
user manual
Editing Objects Manually
From the main menu, select Browse Objects, browse to an object and press Menu.
Delete Object Removes the channel from EZ Scan’s working memory. The channel remains in the library data
I'm sure I'll be quickly lambasted if I'm wrong