As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3199 OUT OF MSP, LT BLEED FAULT AND LT BLEED CLOSED LIGHTS ILLUMINATED SHORTLY AFTER T/O. ATTEMPTED TO RESET WITH NO EFFECT. CLOSED LT BLEED VALVE AND FAULT LIGHT EXTINGUISHED AFTER ABOUT 5 MINUTES. AIR RETURN TO MSP. MAINTENANCE REPLACED LT LP REG. VALVE P/N 785802-3, S/N ON 9611050, S/N OFF 9610013 IAW AMM 36-11-05-2. OPS CHECK GOOD.