Mission Specialists Rick Mastracchio and Clay Anderson removed all four bolts and reseated the Ammonia Tank Assembly (ATA) on the station truss, which succeeded in engaging the troublesome bolt #4. The spacewalkers now are tightening the other three bolts.
Five hours, 16 minutes into the activity, Mission Control gave the crew a “go” to continue with electrical connections to the ATA, but deferred the nitrogen and ammonia fluid connections and the retrieval of micrometeoroid debris shields that had been planned for this spacewalk.