Responded to a service call to troubleshoot multiple electrical issues, including a non-functional ceiling fan light, three inoperative outlets, two GFCI outlets that were no longer tripping, and a faulty light switch in the master bedroom closet. Upon thorough diagnostics, determined that several devices had failed due to poor backstab wiring practices and age (original to the home). Replaced three technician-supplied outlets and plates, two customer-supplied GFCI outlets, and two customer-supplied switches. Provided a discount to account for customer-provided materials. All systems were tested and verified to be in proper working order.