"A key objective of the upcoming flight will be to test the remedial work that has been completed since the December 12, 2020, flight when the onboard computer halted ignition of the rocket motor. The team has since conducted the root cause analysis, completed the corrective work required, and carried out extensive ground testing. The next stage will be to assess and verify this work during a rocket-powered flight."
Source: From a statement by Virgin Galactic, noting that they are opening a flight test window February 13th.