"Hello, my name is Dervis and I'm excited to offer my services as the best fit for your project. With over 15 years of experience in the field of automation, I have worked on numerous projects related to industrial automation, process automation and energy automation. You are looking for a freelancer to help with the repair of a Siemens S7-300 PLC that is experiencing a hardware failure. In addition to the repair, I also require a system upgrade for the PLC.
I have the skills needed to help you with this project - specifically expertise in repairing Siemens S7-300 PLCs as well as strong knowledge of PLC hardware troubleshooting and repair. Plus I have experience in system upgrades for PLCs.
I would be delighted to help you with your project! Please feel free to contact me if you have any questions or would like more information about my skillset and past projects."