469504 Find Relevant Pages with the Source Codes

I have a phpBB forum site, customised by a developer earlier. Now I need to know the file path/folder path to certain site pages containing the Source Codes I am looking for. Specifically, find the precise file path and filename for the site pages that: (1) Sends out an email after users join the site telling him to post 2 new topics into the forum to win prizes in Contest 1. (2) Sends out an email containing download links to prizes, after users have posted 2 new topics into the forum with minimum 30 words in each post(but less than 2 replies to others' topics), in Contest 1; (3) Sends out an email asking users to reply to others' topics; posting 2 replies with at least 30 words to others' topics, to win other prizes, ie prizes in Contest 2. (4) Sends out an email containing download links to other prizes, after users have indeed posted 2 replies of at least 30 words each to others' topics in the forum, in Contest 2. (5) Sends out an email asking users to post topics to the forum to "Release prizes from their digital locker", if they posted 2 replies first but less than 2 new topics in forum. (6) insert download links to prizes (which expire after 48 hours since the link is sent out) into the email template in (2) above, ie in Contest 1. (7) insert download links to other prizes (which expire after 48 hours since the link is sent out) into the email template in (4) above, ie in Contest 2. (8) Sends out an email to users whenever the topics they are watching for have received a reply from other users in the forum; ie sends out the "Topic Reply Notification" email template. (9) Insert the hyperlink to the topics that users are "watching" on the site, ie inserts the hyperlink to the specific topic being watched on the "Topic Reply Notification" email template. The site pages for (1)-(9) containing the relevant codes need be downloaded, and the relevant portion of codes be highlighted in yellow and bold as well to draw my attention to it. State the precise file path to the page too. Lastly, all original pages must be left un-modified on my site after you have checked source pages for (1) - (9) above. ----------- Prefer to deal with developers who handle a job 100%. If job is partially done or developer is unconfident, then don't bid to avoid unnecessary tensions between us later.