Hello Paul,
It's been hot today so it could be that your air conditioning just had to work harder to maintain your selected temperature (did you have it lower than 19 degrees?). The other possibility is that your condenser is past its best.
Did the air con. specialist maintain a vacuum for 30 minutes before recharging?
Simon
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"Whatever is rightly done, however humble, is noble."
Sir Henry Royce.
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