Redo doesn't accept a Transcript

If the original submission worked fine (i.e. it succeeded) and you've just made a small change to your transcript, but when you submit your revised transcript, the Redo rejects with an error like:

FATAL ERROR: Timecode seen but no ^M, ^E, or ^B immediately precedes. 
Stopped at "00:00:02;14 00:00:05;08 >> Canada's unbroken Boreal wilder".

Then it is very likely that you're not submitting the transcript (.TXT file) rather a .QT.TXT (QuickTime text track) or a .ADB.TXT (Adobe Encore subtitles) caption file.

Your transcript should look something like this:

>> Canada's unbroken Boreal wilderness represents twenty-five percent
of the worlds remaining ancient forests. It is globally significant in
its role as species habitant, water filter and carbon storage. 
^M00:00:15
[ Sound effects ]
^M00:00:21
 >> This is Borealis.

Whereas a .ADB.TXT result file looks like this:

00:00:02;14	00:00:05;08	>> Canada's unbroken
		Boreal wilderness represents
00:00:05;10	00:00:06;05	twenty-five percent
00:00:06;07	00:00:08;28	of the worlds remaining
		ancient forests.
00:00:09;00	00:00:12;02	It is globally significant in
		its role as species habitant,
00:00:12;04	00:00:15;04	water filter and carbon storage.
00:00:15;06	00:00:21;07	[ Sound effects ]
00:00:21;09	00:00:21;29	>> This is Borealis.

And a .QT.TXT result file looks like this:

timescale:100}{font:Arial}{size:20}{backColor:0,0,0}
{textColor:65280,65280,65280}{width:320}{justify:center}
{plain}

[00:00:02.476]
>> Canada's unbroken
Boreal wilderness represents

[00:00:05.356]
twenty-five percent

[00:00:06.266]
of the worlds remaining
ancient forests.

[00:00:09.006]
It is globally significant in
its role as species habitant,

[00:00:12.146]
water filter and carbon storage.

[00:00:15.226]
[ Sound effects ]

[00:00:21.316]
>> This is Borealis.

You need to submit a modified .TXT transcript instead of a modified caption file. You can download the .TXT transcript from the top of Details page of your original submission if it was not in the results returned to you (it is not returned by default). To get the Submission Details page, go to Caption/Transcribe -> Status of Submissions, then choose your submission.

If you receive other error messages or warnings when reuploading the transcript, check out this article with troubleshooting tips.