As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY DECLARED COMING OUT OF LGA DUE TO PRESSURIZATION ISSUES. CAPTAIN COULD NOT GET CABIN TO HOLD PRESSURE. LANDED SAFELY BACK IN LGA AND MX HAS BEEN ADVISED OF THE SITUATION. GROUND RAN ENGINE WITH CREW AND OPS CHEKED 10TH STAGE SOV IAW AMM 36-11-00-790-802 NO DEFECTS NOTED A/C OK FOR SVC.