Own a TroyBuilt LTX 2146. Need to know how to access the mechanism that controls the mower deck height adjustment. Although the deck is set on the highest notch, it is scalping the grass. Can tell it has dropped because the custom made blocks, used to ensure the deck is level after maintenance, no longer fit under the deck. Looked in the manual, but it is of no help. Would appreciate any assistance given. Thank you for reading this.