What was found
DURING INITIAL CLIMB OUT THRU 5000 FT, DUCT PRESSURE DROPPED, THEN JUMPED TO APPROXIMATELY 55 PSI FOR A SHORT BURST, 20 SECONDS, THEN STABILIZED. THROTTLES AT CLIMB POWER. CONCURRENTLY FIRST FA REPORTED A DISTINCT ODOR AND POSSIBLE SMALL AMOUNT OF SMOKE. ACCOMPLISHED A HIGH POWER RUN. COULD NOT DUPLICATE. RAN ISOLATION TEST OF BLEED SYSTEMS, & COULD NOT DUPLICATE ANY ODOR OR SMOKE. AS A PRECAUTION, LOCKED OUT HPSOV DUE TO HIGH PRESSURE IAW FIM 21-00-21/301, AMM 36-21-00, 71-00-00, & 36-11-16. OK FOR SERVICE.