As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER START LEFT PACK LIGHT ILLUMINATED. GROUNDED - YES. PERFORMED B737-800 FIM 21-53 TASK 821, PERFORMED BITE CHECK PER FIM 21-62TASK 801 FOUND IN RAM AIR ACT FAULT IN PREVIOUS FLIGHT BUT CLEARS IN BIT CHECK, THIS IS AN INTERMITTIEN FAULT.