Slight water damage, new battery, clean logic board - what next?

Good afternoon guys,

Posted this question a few weeks back:

"Working on my wife's iPhone 6. She was running back in April of this year and got caught out in a pretty good rainstorm. The phone itself was secure in the front pocket of a rain jacket but she had her earbuds in. It seems as the water tracked down the cord from the earbuds and got into the phone.

When she got home, the screen was acting funny and not responding well. We let the phone dry out for several hours and tried a hair dryer several times. Later that evening it started working properly so we decided to back it up to iTunes on our PC. That was were the fatal error occurred. About half way though the back up , the phone died. Phone went black and won't power up. It also felt warm to the touch. I took the phone apart and the water indicator next to the sim card was only slightly pink around the lower edge but there were signs of moisture in the phone."

Since then, I've installed a new battery and completely removed / cleaned the logic board. The water indicator up top was still white. Under a magnifying glass, the only visible corrosion was a slight amount at the eyelet for the screw on the rear of the logic board, at the wifi module. I realize that not all corrosion is visible so I gave the board a good alcohol bath / scrubbing and let it dry for a few days.

Phone wouldn't turn on, so I plugged it in to charge the new battery. The phone got a little warm to the touch around the just below the sim card area. I unplugged it and same results. Charged it the next day, phone never got warm but wouldn't turn on.

Since the water entered through the headphone jack, would the next replacement need to be the Lightning connector / headphone jack? Any guidance is greatly appreciated!

Thanks!