At our airline, we had a mishap with the 737 spoiler system. The spoilers deployed on landing normally, and the handle was placed in the stowed/retracted/down position after turning off the runway.
Trouble was, the spoilers did not retract. The plane was going out again and even though the copilot did a walk around, he could not see the spoilers deployed. There was no indication in the cockpit that the spoilers were still deployed.
Fortunately, there was a deadheading crew which observed the spoilers from the cabin and communicated it to the cockpit in time.
The cable from the spoiler handle had broken just before attempted stowing after landing.
the handle was in the correct place, but didn't do anything.
is it possible the pilots attempted to deploy spoilers on this plane and moved the handle to no avail, or warning of failure?