What specific fluid system component was identified as the focus of intense analysis due to leaks?

The propellant lines feeding the RCS thrusters

The root cause analysis dug deep into why the RCS thrusters were malfunctioning, revealing a highly concerning potential culprit: leaks within the propulsion system. Critically, these were not leaks in the primary propellant designated for the main engine used for deorbit maneuvers. Instead, the focus became the leaks detected in the propellant lines specifically feeding the Reaction Control System (RCS) thrusters. Even a small, persistent leak in this subsystem is serious because the RCS relies on precise timing and maintained pressure integrity to execute the hundreds of required micro-burns for attitude control. A worsening leak during a critical maneuver could lead to a total loss of attitude control, making a precise landing impossible.