Whirlpool Gold Dishwasher NOT working properly

Dishwasher Repair
1

I have a whirlpool gold dishwasher that’s suddenly not cleaning my dishes well. There’s even much of the dishwashing tablet left in the detergent slot after the entire cycle has ended and there is food stuck to the dishes. This has happened multiple times so I’m convinced I have a problem. Any advice?

2

Here are your parts
Replacement parts for WHIRLPOOL GU1200XTLB3 Undercounter Dishwasher | AppliancePartsPros.com

And a manual
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/52521bdbd0ef763c85256cbc00520548/$FILE/8178022.pdf

The most common cause of poor washing is dirty filters and/or something is the pump sump/ impeller area.