HP 42s Bad Key - Advice Requested

[BillBee]

Thank-you guys for the advice.

I will try the ultrasonic cleaning first prior to any disassembly.

On this page:

https://www.keesvandersanden.nl/calculat...repair.php

(Thanks Kees! btw) I got quite an education on the keyboard assemblies.

Not quite as simple as the Voyager and 41 key cleanings.

Thanks again!
Bill