You are performing scheduled maintenance on a critical conveyor system when you discover an undocumented wiring modification made by a previous technician — one that appears to function correctly but bypasses a thermal overload relay. Your supervisor is offsite and unreachable. What is the most appropriate course of action?
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A
Complete the scheduled maintenance, document the undocumented modification in detail, and formally flag it for engineering review before the system returns to full production load
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B
Reverse the undocumented modification immediately and restore the original circuit, since bypassing safety devices is always unacceptable regardless of apparent function
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C
Leave the modification in place, complete the maintenance, and mention it verbally to your supervisor when they return without creating formal documentation
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D
Halt all work, lock out the system, and refuse to proceed until an engineer provides written authorization for the existing modification