Just for completeness to the initial post here.
The problem that caused the lts.conf file editing to make the TC's
unbootbale was in fact as Joseph had mentioned.
All that was needed was to add an additional line break, AKA: ENTER
after the last entry in the lts.conf file.
Once the line break was done,regardless of editor, the file become
'good' and the TC's boot as expected.
Bottom line when editing the lts.conf file,scroll to the very bottom of
the file and hit ENTER at least once.