Bank in the rural Midwest is having modem communications problems at one of its branches and calls in techie pilot fish to track down the cause. Fish first checks out the main branch, then heads out in the pouring rain to the remote branch. Few days later, same bank, same problem. When I arrive, the problem is still occurring.
Tests show transmission errors, but the connections seem fine.
As a safeguard, fish changes the modems at the main bank and the remote branch. They check the line and can see problems, so they dispatch a technician. A week later, same problems, same bank, more rain. Fish calls again, phone company dispatches tech again. So fish and tech brave the downpour to check switches and wiring at the building.