Is there anyone who has knowledge in repairing absorption type refrigerator??

I have one Minibar ,
i've already done all the first aid on how to repair.

1. Heat element gives enough heat.
2. Already inverted the unit and heard that the unit still have its ammonia.
3. All the wiring connection are good as i've tested its continuity.
4. Visual inspection shows that theres no suspicious leak of its tube.

any one who can help me please on what will i do next.????
still the unit did not cools down. But the heat element still heat up.