Phuoc's homework

Dear Mr Tim,
I send you my homework. I write two letter which I imaged. So, I think there are many fault in it. Please check and repair my mistake by using another text colour!
Thank you very much.
Best wishes,
Phuoc, Dao Duy


November 04, 2010
Dao Duy Phuoc
Technicial Superviser
Lotus Limit Co.
393 Dien Bien Phu Street,
Ward 7, District 3
Dear Mr John,
Last month, I bought a invetor at your company. I have a problem with it. On the screen, it display "OL1". Would you tell me what does it fault? How do I slove? It's very important with me.
Please enclose a catalogue of this inventor.
I looking forward to hearing from you soon.
Yours sincerely,
Phuoc, Dao Duy


One day later...


November 05, 2010
John Richard
Sale Manager
American Inventor Community
777 Hung Dao Street,
Ward 9, District 5
Dear Mr Phuoc,
I read your mail about inventor's fault. If the screen display "OL1", it means "Motor Over Load " because:
        Motor drive heavy load at low speed for a long time.
        Sudden change of load
I show you some soloution for this case:
        Change motor
        Check the load
I hope it's useful for your inventor.
I enclosed a catalogue which you request.
If you have another problem of inventor, please contact us again.
Best regards,
John Rechard