AIA Document A201-2017. Spoiler. It’s the Owner.
Division: Construction and Evaluation
Section 3: Administrative Procedures & Protocols (32-38%)
Objective 4: Evaluate responses to non-conformance with contract documents
During a routine inspection to determine if the sandwich is substantially complete. The architect suspects that the contractor used chunky peanut butter instead of smooth as required by the specifications. In accordance with AIA Document A201-2017, General Conditions of the Contract for Construction, the architect requests to see the peanut butter. The contractor disassembles the sandwich, which exposes smooth peanut butter.
Who pays for uncovering the peanut butter and reassembling the sandwich?
The owner
According to AIA Document A201-2017, Article 12, Uncovering and Correction of Work, because the correct type of peanut butter was used, the contractor is entitled to an appropriate adjustment of the Contract Sum and Contract Time.
"Section 12.1.2 If a portion of the Work has been covered that the architect has not specifically requested to examine prior to its being covered, the Architect may request to see such Work and it shall be uncovered by the Contractor. If such Work is in accordance with the Contract Documents, the Contractor shall be entitled to an equitable adjustment to the Contract Sum and Contract Time as may be appropriate."
However, if the work was not in accordance with the contract documents, the contractor is responsible for the cost of uncovering and correcting the Work.
Section 12.1.2 (continued) "If such Work is not in accordance with the Contract Documents, the costs of uncovering the Work, and the cost of correction, shall be at the Contractor's expense."
While the architect’s reputation pays a steep price for the mistake (and for requesting smooth peanut butter when everyone knows that chunky is superior) the cost of uncovering the peanut butter and reassembling the sandwich is at the owner’s expense.

A perfectly impractical solution provided by S Surface via The ARE Facebook Group
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