I have a loss of power and a whining noise, what is wrong? on 2000 Volkswagen Jetta

I have taken my car to several shops and no one can figure out the problem. I have also experienced gear slipage twice since this all started along with power loss and whining noise. Someone is now telling me I need to replace the timing chain and system, could this be a transmission issue?

Asked by for the 2000 Volkswagen Jetta
It very well could be a transmission issue. We would recommend running codes and spending some time diagnosing the exact problem.
This response was from All German Auto but apparently we werent logged in. We are located at 1327 Simpson Way Escondido, CA. 92029. We can be reached at (760)738-4626
The codes have been scanned 4 times now and nothing shows, would a transmission issue pull a code?
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Thisi is monica from china which is a professional manufacturer of Auto Diagnostic Tools in China.
Gearbox has been reconditioned new bearings and pinion .New clutch and pressure plate.but gearbox is winning on startup but goes away when clutch is engaged