AC leak / low pressure

AC is blowing only warm air, but a few months ago it was working perfectly, and then slowly started to work intermittently. In some cases would get cold like normal, then would get warm after a few minutes and usually would stay warm.

At this point I know I have leaks at both schrader valves since I can see bubbles and hear hissing with the caps off. There is also a pretty obvious leak at one of the "pressure" type fittings (I don't know the proper terminology) on a hose that is going from the compressor to the condenser. It is a short section of rubber hose that connects to the hard line before the condenser. I attached a photo to give you a general idea of the type of hose that it is, but this is not the exact hose as far as I know. Is there a way to repair the existing hose, or does the entire section of hose have to be replaced? Any tutorials/videos that you could suggest for this type of repair/replacement?

Though I suspect the problem is most likely only to do with the leaks, I still took full gauge readings just in case you might suspect any other problems based on the readings.

Here are my readings with outside temp of 79 degrees, 19% humidity:
cold engine OFF: low=45psi, high=45psi
hot engine OFF after running the system for about 20 minutes: low=65psi, high=65psi

The following readings are with AC and fan on high:
engine idle at operating temp: low=0psi, high=75-80
engine at 2,000rpm at operating temp: low=negative psi (at very bottom of scale on gauge), high=80psi

Thanks for your input!
-Ben