Hi there,
Since replacing the solenoids hasn't solved the issues, it's likely an electrical issue. Here is some info for you for these codes.
P0765 KIA - Overdrive Solenoid Valve System Read more: https://www.autocodes.com/p0765_kia.html
P0755 KIA - Underdrive Solenoid Valve System Read more: https://www.autocodes.com/p0755_kia.html
P0760 KIA - Second Solenoid Valve System Read more: https://www.autocodes.com/p0760_kia.html
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