i have a Carrier year 1999 or so heat pump / AC and I noticed it leaking freon out of a big black canister next to the compressor...What is that canister called??? it's about half of the size of the compressor and attached to it ... I think it has a rusty hole at the bottom.. otherwise the compressor works and shut it off so nothing else happens to the compressor ...does anyone know what that part is called and also a recommendation for a good tech in the Parrish Florida area? thanks!!