Custom Joomla fix needed

I have a members site in joomla that has been heavily customized. The previous developer created a registration process that has some bugs in it. I am looking for someone who can evaluate the process, backup the current code, modify the code and implement the fix. Registration Process: 1. User receives invitation code in email to register 2. user visits site and enters code 3. user fills in registration form and submits info 4. user receives thank you message and 1st button to activate account 5. user is redirected to final activation page to finalize account. The problem is in step 5 the final activation is asking the user for password when it should be activating the account. this was previously working.