Dear Tweety,
I have discussed with my Specialist regarding the issue with one of your air-con unit, which is one out of five units cleaned and tested last February when you were also present during the cleaning. Yesterday late afternoon, my Specialist has come to your place to check again on that one unit upon your request to do so last Sunday. I have PMed you regarding the unit condition based on my Specialist's inspection ya my Dear, and how we can resolve it. Also I can arrange him to call you to explain directly since yesterday it was only your parents around; and also to possibly see you again to make clear of the unit's technical issue and what we have done in the last servicing in Febtuary. Please kindly follow up my PM for the further arrangement and how we can solve the issue ya. Thanks a lot.