As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1920, MSY-LGA. (AIRCRAFT DECLARED AN EMERGENCY INTO LGA), ' HYD B RESERVOIR LOW LEVEL IN FLIGHT INDICATOR SHOWED VERY LOW FLUID IN B SYSTEM; REMOVED AND REPLACED B HYD PRESS SW (10CE1) SEAL REF AMM 27-92-17. OPS CHECK OK. LEAK CHECK OK. AC OK FOR SVC.'