Had the same problem on my 7120 a few years ago.    Pulled the roof only to find the drip pan clean and drip hoses open.   You may find that yours are plugged.  However,   has it been humid in your area?   A guy on here from Georgia told me on a hot humid day with the fan on high, the air blast past the condenser blows the moisture into the vents instead of allowing it to drip in the pan.    The fix on the humid days is to run the fan on medium....worked for me.