We have multiple problems with our Magento website. This project includes looking at the code/admin/ftp/files/error logs to provide a list of the problems, what is needed as solutions, and time/cost to fix the items. We have installed numerous extensions, have 2,000 products and multiple categories. We need help to get the site back to clean and fast code with no errors.
Some of the problems include:
1. Very slow initial load times
2. Thousands of 503 errors in webmaster tools
3. Many navigational links that are broken and go to single products instead of categories, or they are a 404 error
4. Other various bugs throughout the site
You must be an expert in Magento.
Please list how you will go about troubleshooting the site and how long you think it would take to do it.