Have you checked the settings in both EZI2C components and tuner I2C parameters are same? Please verify if the I2C speed, I2C address in EZI2C component and tuner are same or not? Can you please attach the snap shot of the error. Please check with I2C speed of 100kHz and check if it is working.
I have finally connected the board to Tuner GUI using the same settings but Port Pins P4.0 and P4.1 as the EZI2C component.
Kind of surprises me as the manual recommends using Pins 3.0 and P3.1. But finally it works.
Thanks for your thoughts and help.