As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL350 HYD SYS A QTY INDICATING 74% & CONTINUED TO DROP. QTY A LOWEST LEVEL INDICATED 62%, DROPPING 1% - 2% EVERY 8 TO 10 MINUTES. PRESS ON SYS A REMAINED AT 3050 PSI, SYS B QTY DROPPED TO 85%. REPLACED SYS A HYD QTY TRANSMITTER IAW AMM 29-33-12. SERVICED RESERVOIR TO 97%, B SYS AT 92%. CYCLED FLT CONTROLS & FOUND NO LEAKS. NO HISTORY OF PROBLEM. ROTABLE PARTS CHANGE WAS INDICATED TT 1610961, SN OFF 02774 TRANSMITTER, HY OFF 29-2909-9-9001 2774 ON 29-2909-9-90011996.