export articles 1.7.6-pl from modx rev 2.2.13-pl to modx 2.3.1 articles version 1.7.10-pl

I have a large number of articles that I need transferring from the old modx 2.2.13-pl articles version 1.7.6-pl to the new version of modx 2.3.1 articles version 1.7.10-pl, i was wondering if anybody knows how to do this? is there an add-on that will allow me to do this? or a manual way of copying certain fields from within a table in the backend?

Thanks