MacBook Air A2179 Not turning on, pulling 0 mA at 5V repair

Problem description
MacBook not powering up, SLPS2R and AWAKE voltages/signals all 0, PP3V3_G3H 0.9V, PP3V3_G3H_RTC 3.3V.

Symptoms

 * MacBook not powering up.
 * SLPS2R and AWAKE voltages/signals all 0.
 * PP3V3_G3H 0.9V, PP3V3_G3H_RTC 3.3V.

Solution
PMU_VDD_HI signal is not reaching U7800 (figure 1) due to corroded R8050 (figure 2).