Unless it got wet, it is fine. The person selling it likely knows no more what they are talking about than you do.

Issues with the top usually are, in descending order of likelyhood:

trunk divider switch (easy)
top open switch (easy)
loss of sync due to an incomplete cycle or weak battery (just do the manual top cycle three times with the engine running) (easy)
Trunk lock failure, (little harder to trace but easy to replace)
BCM failure, (hard to track down, easy to replace)
PTCM failure, (hard to track down at times, easy to replace)
CAN bus failure, (sell the car for parts)