Hello,
I've just been using the following stylesheets to try and convert MARCXML 
files to MODS.  
http://www.loc.gov/standards/mods/v3/MARC21slim2MODS3-3.xsl
http://www.loc.gov/standards/mods/v3/MARC21slim2MODS3-4.xsl
I wanted to ensure that the 653 fields along with indicators contained in 
the MARC records were retained during the conversion process as described 
on the following page http://www.loc.gov/standards/mods/mods-mapping.html. 
Unfortunately I have found that version 3.3 although it retains the MARC 
field content it does not seem to interpret the indicators and therfore 
use the correct elements as set out on the MARC Mapping to MODS page 
http://www.loc.gov/standards/mods/mods-mapping.html with regards to the 
indicators.  Version 3.4 seems to ignore the 653 altogether. For example 
in MARCXML I have the following:

<datafield tag="653" ind1=" " ind2="1">
<subfield code="a">F. W. Roger Brambell</subfield>
</datafield>

<datafield tag="653" ind1=" " ind2="2">
<subfield code="a">Brambell Laboratories, Zoology Dept., Bangor 
University</subfield>
</datafield>

<datafield tag="653" ind1=" " ind2="4">
<subfield code="a">November 17, 1971</subfield>
</datafield>

<datafield tag="653" ind1=" " ind2="6">
<subfield code="a">Photo negatives</subfield>
</datafield>

<datafield tag="653" ind1=" " ind2="5">
<subfield code="a">Bangor (Wales)</subfield>
</datafield>

Which converts to MODS 3.3 as...
<subject>
<topic>F. W. Roger Brambell</topic>
</subject>
<subject>
<topic>Brambell Laboratories, Zoology Dept., Bangor University</topic>
</subject>
<subject>
<topic>November 17, 1971</topic>
</subject>
<subject>
<topic>Photo negatives</topic>
</subject>
<subject>
<topic>Bangor (Wales)</topic>
</subject> 

And does not convert at all to MODS 3.4.

I also notice that the 242$a MARC field appears twice after converting. 
For example in MARCXML I have the following..

<datafield tag="242" ind1="1" ind2="0">
<subfield code="a">Opening of the Brambell Laboratories of the Zoology 
Department of Bangor University in rememberance of Professor F. W. Roger 
Brambell.</subfield>
<subfield code="y">eng</subfield>
</datafield> 

which then converts to the following in both versions 3.3 and 3.4 of the 
stylesheet.

<titleInfo type="translated" lang="eng">
<title>Opening of the Brambell Laboratories of the Zoology Department of 
Bangor University in rememberance of Professor F. W. Roger Brambell</title>
<title>Opening of the Brambell Laboratories of the Zoology Department of 
Bangor University in rememberance of Professor F. W. Roger Brambell</title>
</titleInfo>

Would it be possible to fix these in version 3.4 of the stylesheet? 

Thanks,
Vicky