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Hall light only works sometimes

REVIEW COPY. Every reading and explanation is a placeholder until Jordan checks it. The reviewer table at the bottom lists them all for each fault.
Customer report
The hall light only works sometimes. You have to flick both switches to get it to come on. The globe's been replaced and it's no different.
Circuit
Two-way lighting. Active goes to the common of SW1 (bottom of stairs). Two strappers run to SW2 (top of stairs), and SW2's common switches the active to the light. Up selects strapper 1, down selects strapper 2.
Your job
Find the fault with the fewest tests, working safely. The fault is different each time. Every test costs 2 points, unsafe steps cost more.

Circuit

AN SW1 (bottom)SW2 (top) Strapper 1 (up)Strapper 2 (down) Light

Safety actions

Live tests are done energised with insulated probes and the right PPE. Dead tests need the circuit isolated, locked, tagged and proved dead.

Choose a test

Meter · ready

Score

100

    Call the fault

    Reviewer table

    Pick a fault to see every reading the simulator shows for it. Chapter reference: [Jordan to add Bible chapter]

    TestConditionReadingWhat it tells you