What was found
FLT 2637, JFK-STI AIRTURN BACK TO JFK. DURING CLIMB #1 ENG BLEED FLUCTUATED 6-18 PSI AND EPR FLUCTUATED SLIGHTY AT CLIMB POWER < QRH 2-20 BLEED ABNORMAL PR FOLLOWED < EPR NORMAL WITH X-BLEED OPEN ; R&R #1 ENGINE BLEED AIR PRESSURE INDICATING AIR TUBE IN PYLON GOING FROM LOWER PRV DUCT TO PYLON "AFT" IAW V2500 CMM 36-21-49.PERFORMED #1 ENG HIGH POWER RUN IAW AMM 72-00-00.OPS CHK O.K NO BLEED FLUCTUATION.AIRCRAFT O.K FOR SERVICE