The Institute of Bankers have various courses - one of them being "Credit and lending". This is mainly focused on loans etc. but there is a section that gives a brief run-down on assessing audited accounts for underwriting purposes. Only thing is, the course would cost a about €1000 and you'd have to become a member too - membership fee would be approx €72.
Would be worth your while doing it though to get the qualification behind you. Plus, if you're employed in that field your employer may offer to refund you the money paid for the course!!
Check out the website: where you can request a prospectus to find out more!!