Compare these equal-length Local Services Ads reports. Identify when lead volume changed, whether spend or lead mix also changed, and whether reporting or configuration changes could explain it. Separate observations from hypotheses; give the smallest checks that distinguish them. Do not increase budgets, promise recovery or label a cause without evidence.

INPUTS
lsa-periods.csv: period_start, period_end, lead_id, lead_type, charged_amount, credit_status, currency
changes.csv: change_id, changed_at, setting, old_value, new_value; scope.txt: timezone, reporting coverage, account migration status

OUTPUT
lead-decline-review.csv: period, observed_metric, comparator, difference, coverage, possible_explanation, next_evidence_check

Use only these synthetic or firm-approved inputs and preserve source row/page IDs. Keep missing or conflicting evidence unresolved. Return a draft for the named reviewer. Do not send messages, connect accounts, change records or permissions, move money, or make legal decisions. Keep source files unchanged. List missing prerequisites before continuing.
