As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING ODOR ON TO LT DUCT PRESS 85. RT DUCT PRESS 45, PERFORMED WALK AROUND, NO EXTERNAL FINDINGS NOTED. C/W TASK 05-51-26-800-801-C1 CONDITIONAL INSPECTIONS FOR SMOKE IN CABIN. FOUND NO FURTHER INDICATIONS OF BURNING ODOR. CONTINUED TO TROUBLESHOOTING LT DUCT PRESS INDICATION IAW AMM 36-11-00-700-801. FOUND PRSOV TO BE AT FAULT. REMOVED AND REPLACED NR 1 ENG PRSOV IAW AMM 36-11-04. OPS CHKD GOOD. RAN NR 1 ENG AT POWER, BLEED SCHEDULE CHK. LEAK CHKD GOOD. LT DUCT PRESS WITHIN LIMITS. ACFT IS OK TO RETURN TO SERVICE.