SWBT Company must decide whether to repair a telephone company computer-based central office switch or purchase a new one. The existing switch originally cost $750,000 and is fully depreciated. The switch can continue to be used if maintenance expenses of $400,000 (this amount is considered a fully taxable expense) are expended now, after which the switch would last 3 more years and have a salvage value of $50,000 at the end of the 3 years.  The new switch will cost $600,000, will last 5 years, and will have a salvage value of $100,000. Due to its age, the old switch will require $20,000 more per year to maintain than the new switch. If the new switch is purchased, the existing switch can be sold in its present condition for $25,000. SWBT has a required return of 12% and a 34% tax rate. What choice should SWBT make?