- Jill has repaired the roof Jill has repaired the roof herself, and the roof looks brand-new. - Jill had repaired the roof The action took place before an other action, but the latter is not stated You need something more, like "Jill had repaired the roof before the storm", or "... before we arrived".
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I'm afraid that this is not a conclusion that can be drawn with complete certainty from the language given.