Whirlpool Wall Oven making loud noise and shaking after heating

my whirlpool oven started to make loud tumbling noise after heating up a while and will keep the noise on even after i turn the oven off. shall i go for a repair?

Here are your parts
Replacement parts for WHIRLPOOL RBS275PDB14 | AppliancePartsPros.com

Here is the tech sheet
http://www.servicematters.com/docs/wiring/Tech%20Sheet%20-%208301757.pdf

Sounds like a problem with your cooling blower (Item 3 in Section 5)

thanks! is this something i can change myself or need to call for professional services?

Depends on how handy you are.

I do not have a manual for this unit perhaps someone else can add it.

I do have the following for a double oven which may be helpful in helping you decide.
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/7d69e72584ddde3385256a7e00524e76/$FILE/8178007.pdf