Tuning My bird spring a leak

After many months in hibernation my Colibri got out of the safe and enjoy some fresh air and I noticed the gauge didn’t show the same pressure as when I stored it away for these many months so I decided to bring out the bubble water to hunt for the leak. I discovered a very slow leak coming from the high pressure side of the regulator here with the red arrow. 
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time to bring out the tools and o-ring set. 
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the high pressure o-ring was out of shape as you can see here. 
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after a hour later with with two new o-rings (I replaced the low pressure side as well since I had regulator open) the bird is ready for this weekend. 
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