So I diagnosed a leak in a system (small carrier rooftop, horizontal condenser fan), moved some of the parts to the identical system next to it to get some cooling in a computer room. A few weeks later the repairs were approved. I repaired the leak, installed a new blower motor, new dual capacitor, did the other stuff too. When I started it up with the refrigerant, the compressor made that 'backwards noise' and my pressures were equalized. I had to do a double take because I knew I saw suction in the initial diagnosis. So I shut it off, started it again and all was well. Has anyone seen this before on a single phase scroll? It has me scratching my head.