Is the P0336 code still present or not. You only say that you had a code - not that you still do.
Assuming that you now have no codes - the EGR is not a part. Its a whole system. There is a feeder system from the exhaust to the valve. There are the openings into the intake. There is a wiring/power supply for the valve. There is often a sensor and control solenoid, but I think that in your system those things might be integrated into the valve - not sure but you need to get the specifics of your EGR system operation and check the entire system