Custom report broken on upgrade from 4.2.7.to 4.4.3a

[lesley]

Sorry if I'm in the wrong place.
I paid a developer for a custom report that was written for 4.2.7 and based on bookkkeeping transactions report.
It's broken on upgrade to 4.4.3 because (I think) of the changes to the schema of civicrm_contribute.
I've attached the files in the hope that someone can assist me to make it work again. (i've tried changing all references to contribution_type_id to financial_type_id but didn't help)
Really out of my depth here but prepared to give it a go if some kind soul could point me in the right direction.

Also I've never known why there are 2 files? Paths are respectively   Custom_php/CRM/Core/DAO and Custom_php/CRM/Report/Form/Contribute
Can't afford developer again so all help much appreciated