Question: How do I solve this equation in Maple

when i'm trying to solve, i get the following warning: Warning, solutions may have been lost

> TC := (p*A*((lambda-sigma)*(e^(lambda*t2)-1)+lambda*(e^((lambda-sigma)*T)-e^((lambda-sigma)*t2)))/(lambda*(lambda-sigma))-Ca-A*e^(lambda*t1)*((beta*a2+b2)*(e^(beta*t1)-1)/beta^2-(lambda*a2-b2)*(1-e^(-lambda*t1))/lambda^2)/(beta+lambda)+A*e^(lambda*t1)*b2*t1/(lambda*beta)-W*((alpha*a1+b1)*(1-e^(-alpha*t1))-alpha*b1*t1*e^(-alpha*t1))/alpha^2+A*(e^(lambda*t2)*((a1+b1*t2)*lambda*alpha+b1*(lambda-alpha))-e^(lambda*t1)*(b1*(alpha^2-lambda^2*e^((lambda+alpha)*(t2-t1)))-(a1+b1*t1)*lambda*alpha*(alpha+lambda*e^((lambda+alpha)*(t2-t1))))/(lambda+alpha))/(lambda^2*alpha^2)+Cs*A*e^((lambda-sigma)*t2)*((T-t2)*(lambda-sigma)-e^((T-t2)*(lambda-sigma))+1)/(lambda-sigma)^2-L*A*((e^(lambda*T)-e^(lambda*t2))/lambda-(e^((lambda-sigma)*T)-e^((lambda-sigma)*t2))/(lambda-sigma))-C*(A*(e^((beta+lambda)*t1)-1)/(beta+lambda)+W+A*(e^((lambda-sigma)*T)-e^((lambda-sigma)*t2))/(lambda-sigma)))/T;
>
> TC2 := subs(t2 = (ln(W*(lambda+alpha)/A)+(lambda+alpha)*t1)/(lambda+alpha), TC);
>
> x1 := diff(TC2, t1) = 0;
>
> x2 := diff(TC2, T) = 0;
>
> x3 := subs(A = 290, lambda = 4, a1 = .9, a2 = 2.4, b2 = 0.1e-1, b1 = 0.1e-2, alpha = 0.2e-1, beta = 0.4e-1, W = 90, Ca = 100, L = 11, C = 9, p = 12, Cs = 4, sigma = 0.2e-2, x1);
>
>
> x4 := subs(A = 290, lambda = 4, a1 = .9, a2 = 2.4, b2 = 0.1e-1, b1 = 0.1e-2, alpha = 0.2e-1, beta = 0.4e-1, W = 90, Ca = 100, L = 11, C = 9, p = 12, Cs = 4, sigma = 0.2e-2, x2);
>
>
> x5 := solve({x3, x4}, {T, t1});
Warning, solutions may have been lost
>
>