Not booting up, 3 beeps (pause) 3 beeps. Replaced logic board no fix

Hey I need some help. My macair won’t Boot up, it has the 3 beeps (pause) 3 beeps. I’ve already Replaced logic board I bought from the site and at fix it worked and then the screen would feeeze and now it’s doing it all over again and I thought the logic board would of been the fix. That’s what Apple was telling me but now they pointed out there was some corrosion on the i/o board and I’m unsure if that would cause and issue such as this. Or do I need to send this logic board back in to be replaced? Anything helps. Thank you