Westinghouse oven pdr790s manual muscle

Pulled all three knobs off the oven, pulled silver plate off - needs a bit of muscle. Unscrewed plate under that. Unclipped timer put new timer in reconnected Oven, Westinghouse, PDR790S, DBL Oven multifunc top, BTM, RRP $2189,Category B 12 months full parts & labour warranty, must attain warranty advice form