The argument of the STYLEREF field should be "Heading 1", though the allow multi-language support, that can be replaced by 1
{ STYLEREF "Heading 1" }
or
{STYLEREF 1 }
Note \s is not a valid switch for a STYLEREF field. Table 1-1, the switch for the STYLEREF field should be \n
Word assembles the Field codes when inserting the Caption. All arguments are as Word assembles them. The "0"'s are "1" when the field is working. The \s is as Word assembles it though I know not what it does.
The Open and Repair went thru just about all the Linked Excel data added to the document. Some of which is HTML and some Unformatted text. All Excel data is from a network file. In fact both files are network files but in slightly different folders.
Word 2007 w/SP3 on Win-7 Enterprise x64
I've seen this occur in other Word files with Linked data in the past as well so it's not specific to this file nor is it specific to this version of Word or Windows. The issue was present in Word 2003 under WinXP32.