PHP ETL / Java Report Help

We looking for help with an ETL-type PHP script that performs queries on a Sybase SQL database with raw logs of VoIP calls, and populates a MySQL database with a summarized version of the data. Once this completes, we execute a Java program that will generate PDF invoices for each customer account and billing period. The script runs fine most of the time, but we have encountered issues some of the invoices are coming up blank, due to no call activity picked up ETL PHP script. Some of the queries may need tweaking and troubleshooting is required. At this point we have reasons believe the ETL script is failing, so strong PHP skills are essential for this project, with emphasis on queries to a sybase sql database. Once troubleshooting done, we expect you to implement the fix and test it. If the problems lays in the Java report code, unless you have the skills to troubleshoot and fix, we have Java resources that we can pull for this project. The important thing here is to troubleshoot the problem. We may implement enhancements over time. This script is essential to our business and we are looking to develop a long-term relationship. Linux skills are essential. We use Ubuntu. You will have access to SSH to work on the server. We use Skype and expect you to be available at predetermined times only to chat about project and for support. Please bid for the troubleshooting fees. Support fees will be negotiated based on your experience and the extent of your involvement in this and some of our other projects.