The field service engineer checked for correct operation of foot support (footrest).
The unit operated as expected.
He could not find any sign of damage that may have contributed to support disengaging.
The investigation showed the operator failed to check the correct locking of footrest into place, as required by the instructions for use.
This is a user error.
The instructions for use clearly warn the operator (danger!) that upon footrest mounting the correct locking must be checked, and describes how this is to be done.
The customer was informed about the correct use of positioning and was retrained according to the instructions.
No technical correction needs to be done because of no malfunction.
The system works as specified.