As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: AFTER TAKEOFF BOTH SPAR VALVE CLOSED LIGHTS ILLUMINATED BRIGHT AND CIRCUIT BREAKERS B3 AND B4 BEHIND FO SEAT BOTH POPPED. AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT ORD. FOUND CIRCUIT BREAKER OUT NOT POPPED, ACCOMPLISHED SYSTEM TEST, PER AMM 28-22-00. VERIFIED NORMAL ENGINE RUN OPERATIONS AND INDICATIONS. NO FAULT FOUND.