Denon dvd2500bt

Just got this, the Denon blu ray transport.
The seller (for which I believe them) said it was all working fine.
Basically the drawer is very slow to open, and sometimes doesn't make it, needing assistance.
My first thought is a belt? But would that not happen over time.
My other thought it may have been stored for a couple of weeks in a non heated warehouse,. Could the cold affect it?
Is it simply a case of letting it warm back up for couple days, or is it worth investigating further, for a belt issue, although on first inspection I cannot see it.
It all works fine in terms of, once the disc is in, and in lovely condition.
It was very very well wrapped, so cannot believe the courier damaged it either.
Thanks all.
It wasn't expensive, so happy to have a tinker.