Given the parts were listed as an "Obsolete item", it may be worth it to evaluate the parts. Substitution of parts in either repair or a new build can sometimes be an issue depending on how customers track their BOMs, if approvals are involved, etc.
As it happens, a couple years ago I had this situation:
A customer had a malfunction in their system. Visual inspection showed slight expansion of the pressure relief on the Panasonic SMT 47 uF electrolytic on the board. The board was 10 years old. The customer got very concerned and jumped to the conclusion that it was the cause of their issues. The expansion was noted on local examples of similar vintage and date code, and institutional memory verified that it was there from the time of production.
As they were at a remote location, visiting the site was not possible. However, they happened to have an LCR meter available. I made measurements of several boards, both old and new, along with measurements of NOS capacitors of the same vintage, new capacitors of the same part number, and similar parts from other suppliers. I then requested measurements from their board, leaving the part in-circuit.
The measurements from the customer were the same as what I got with all variations of parts. There was no performance change between their board, my examples, my NOS parts, and new parts from both Panasonic and others.
Examples of all the parts were sent to Panasonic in Japan, along with the example circuit board that showed an expanding top. The NOS parts were evaluated, along with the questionable part. All measured very similarly. Their evaluation was that the parts were overheated during the soldering process at the manufacturer. As it happens, we had moved to a different board assembler soon after that initial run due to other quality issues.
I believe the problem at the customer site was tracked down to EMC issues.
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