Of all the possible test buttons you seem to have one of the easiest to replace. As Grumpy said, you should be able to pry it out...and if you damage it prying it out, no problem. It may not be super easy to find a momentary contact switch that size, but you will find something the correct size. If you cannot find a momentary contact switch, a regular SPST switch should work...you'll just have to remember to turn it off again. Once you get it out, you should be able to find specs on printed on the switch to search online.
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2020 Eagle HT 30.5 CKTS Modern Farmhouse (16" wheels, spring shackles set on lower hole of frame, SumoSprings TSS-107-40, standard kingpin, B&W Companion slider, TST-507 TPMS, Progressive Industries hardwired 50A EMS HW-50C)
2019 F250 SRW SuperCab 4X4 SB 6.2 (10,000# GVW) 3.73 Axle 18" wheels
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