What propulsion issues did Starliner encounter en route to the ISS?

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Starliner Experienced Propulsion Anomalies During its Journey to the ISS

Boeing's Starliner capsule encountered two propulsion-related issues during its uncrewed test flight to the International Space Station (ISS). Specifically, two of the twelve orbital maneuvering and attitude control (OMAC) thrusters on the spacecraft's aft side failed to operate as expected, and a device responsible for cooling the capsule was initially slow to activate. Despite these anomalies, NASA officials indicated that the mission remained on schedule.
Thruster Malfunctions on the Aft Side

During its transit, Starliner experienced a problem with its OMAC thrusters. Two out of the twelve thrusters located on the aft section of the capsule fired initially but then abruptly shut down. This unexpected shutdown necessitated that a third thruster compensate for the loss of thrust from the two malfunctioning units.
Slow Activation of the Cooling Sublimator

Another issue noted was with a component critical for maintaining the spacecraft's internal temperature. The sublimator, a device tasked with cooling Starliner, experienced a delayed start. Engineers are currently investigating the exact reasons behind both the thruster failures and the slow activation of the cooling system.

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What propulsion issues did Starliner encounter en route to the ISS?

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