Sprint and Cisco technicians install the remaining upgrades using hardware that arrived late Friday afternoon. Initially, stability is substantially better. A software feature is disabled, which avoids the packet loss bug at the expensive of lower packet switching performance and greater likelihood of instability. The bug is a known issue, which is corrected in a later version of the software. One of the new hardware modules begins to fail, causing the router's bus to be repeatedly reset.
Software is suspected.
A later software revision is loaded, but fails to improve the situation. Sprint technicians open a case with Cisco to get replacement hardware. Cisco determines that a replacement module is not available anywhere in the region. Sprint technicians complete the task of migrating all customer feeds from the faulty module to another module in the same router. No progress is made in diagnosing the problem.