Yup I'm aware of that - no good tech would diagnose a system based on pressures alone.
For a refrigerant leak: deteriorating performance over time, oil at the site of the leak (you won't spot this if the leak is inaccessible), high operating costs.
I really think first tech misguided me and wanted to sell new system. 2nd Tech did replace valve on the HOT side of the pipe. My machine is working great since the repair (30 hours).
Is there any sign I should look for?
economic collapse is a certainty. debt based fiat currency monetary systems can never continue indefinitely because they require continuous creation of new debt to service the existing debt. in the absence of economical growth (which is always predicated on increased resource extraction rather than capital alone), this leads to massive inflation which destroys the currency.
your leaders can't fix this - they're corrupt and only exist to enrich themselves and their corporate friends.