I normally would have vacummed it down and checked for leaks but its been sitting 2 years. the compressor came on so we know it still has some pressure and the leak is very small. it fast cyles, so we know its not enough refrigerant. the only situation where a top off is a good bet.
link to ac pressure hose set, i earn a commission on sales.
https://amzn.to/42y0Veb