Need Ongoing HTML & PHP maintenance

I have several clients who require regular, ongoing maintenance of their sites including PHP fixes. Unfortunately my present vendor has not been reliable in communicating with me and is slow in responding to requests for help. My client sites contain basic errors that need to be cleaned up to allow for SEO optimization. There are also PHP and MySQL errors that I believe are the result of sloppy programming, but are effecting performance. I will post examples of some of these sites once you place a bid. Please bid per week. I understand this will require some flexibility as we adjust for the work level. I'm looking for a long-term relationship with someone who is competent, reasonable in price, and available on a regular basis.