There is a leak at the base.

draining tube plugged which normally would drain defrost water to a evaporating pan under fridge

You may have a leaking door seal, check for gaps in the door seal.

Please check the link for some tips on fridge leaks:

http://www.espares.co.uk/advice/fridges-and-freezers/a/2/1433/how-to-fix-a-leaking-fridge.html

Sounds to me like you have a leak, probably from an ice maker tubing connection or vinyl water supply tube itself. Have someone get a good flashlight and get a good closeup look at where the water is coming from. The water supply to the fridge's icemaker comes from the house wall, floor, or cabinet area of sink. Often they are connected to fridge, then someone moves the fridge to clean and the line gets run-over or tugged on too hard causing a leak. If that is cause, install a new line (hardware stores have these specific to ice makers, 1/4" vinyl or copper tubing) and it should be coiled several times in mid air near the wall, so if fridge is moved out it just uncoils not incurrs damage from un-noticed tension (full amount of water pressure in that little line).

2nd possibility for newer type fridge. All frost free fridges have a pan underneath that catches condensation from coils, from the pan the water evaporates into the air where balance is achieved and pan is never full. On rare occasions, like during moving, on some the pan isn't fastened down and can fall out of place, then condensation water from the coils falls to floor (not any great amount but some).

That might be a leaky water valve connection Or it could be bad door gaskets.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

Removed inside rear and floor panels of freezer (ice machine also) as ably advised by your tech. Found ice damming he suspected underneath floor panel. Thawed overnight with pot of hot water in freezer. could see that small rear drain tube was iced shut; why all water going into fridge below. Avoided floor mess from thawing water flow to evaporation pan on floor by tilting unit forward on blocks and laying several old towels inside freezer door to catch water that would run out. Also placed some in front at base of unit on kitchen floor. Continuing to thaw pipe to unclog, it is iced some way down, again as tech said it might. Will reassemble and be careful with freezer setting, in case it may have been too cold. Also, some food crumbs had found their way behind panel near this drain tube and may have fallen in to block it. Will clean out any remaining.

Your evaporator drain pan under the fridge may be misplaced. If so, simply pull out the unit and place the pan back where it goes under your box. Hope this helps!

The drain is clogged and needs to be snaked out.

Have a look at this link:

http://forum.appliancepartspros.com/refrigerator-freezer-repair/7670-leaks-water-floor-front-freezer.html

or this one:

http://www.ehow.com/video_112132_fix-leaking-refrigerator.html

It's stopped completely 
It's not cool
Cooling is poor
It's noisy 
It leaks
The freezer compartment is icing up
The food in the refrigerator freezes
There's water dripping inside the refrigerator
The refrigerator never cycles off
The ice maker has a problem
There's an ice- or water-dispensing problem

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