This is just for anyone else that might see this thread in the future.
I am using a LCD 2004 i.e. 20 characters per line and 4 lines. I didn't use any external pull up resistors.
I following this Tutorial https://community.particle.io/t/i2c-information/46672 Found that LCD display has an address of 0x27 as displayed by the code Arduino Playground - HomePage
And then I used this example but changed the address to 0x27 rather than 0x3F
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