Internal Sliding Door Removal

I have a couple of sliding doors that fit inside a gyprock covered wall. I would like to be able to remove them so as to replace the rollers as the house is 24 years old and some are now quite noisy. Have removed two pieces of timber at the top of the door to reveal the two roller mechanisms but I have tried to lift them off the track but there is no movement. What are the tricks of the trade to get these doors out?
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