Modifications and additions that affect the capacity and safe operation shall not be performed by the customer or user without manufacturer s prior written approval?

a$.1910\mathrm{.}178($b$)(4)$

b$.1910\mathrm{.}178($c$)(2)($ii$)($a$)$

c$.1910\mathrm{.}178($g$)(10)$

d$.1910\mathrm{.}178($a$)(4)$