Finding a link to buy an MRPA011 can be tricky if the part is "Legacy" (no longer in active production). In these cases, you’ll want to look for: For new-old-stock (NOS).
Sometimes a link provides the latest firmware, which might not be compatible with older base units. Conclusion mrpa011 link
Ensure your physical wiring matches the diagram found via the link. Finding a link to buy an MRPA011 can